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Phys 421 MC

Total questions: 109

Worksheet time: 18hrs 10mins

Name
Class
Date
1.

the figure shows two unequal point charges, q and Q, of opposite sign. Charge Q has greater magnitude than charge q. In which of the regions X, Y, Z will there be a point at which the net electric field due to these two charges is zero?

a)

Only regions X and Z

b)

Only region Z

c)

Only region X

d)

only region Y

2.

A positive charge q is released near a positive fixed charge Q. Which of the following is true?

a)

q mill move with decreasing speed

b)

q will move with constant acceleration

c)

q will move with increasing acceleration

d)

q will move with decreasing acceleration

3.

Four point charges of equal magnitudes with with varying signs are arranged on three of the corners and at the center of the square of side d as shown in the figure. Which one of the arrows shown represents the net force acting on the center charge?

a)

A

b)

B

c)

C

d)

D

4.

Four point charges of varying magnitude and sign are arranged on the corners of the square of side d as shown in the figure. Which one of the arrows shown represents the net force acting on the point charge with a charge +Q?

a)

A

b)

B

c)

C

d)

D

5.

Two stationary point charges q1 and q2 are shown in the figure along with a sketch of some field lines representing the electric field produced by them.

a)

q1(-) and q2(+); the magnitudes are equal.

b)

q1 and q2 have same sign; magnitudes are equal

c)

q1(+) and q2(-); magnitude of q2 is greater than the magnitude of q2.

d)

q1(-) and q2 (+); magnitude of q1 is less than the magnitude of q2.

e)

q1 and q2 have same sign; magnitude of q1 is greater than the magnitude of q2.

6.

Four dipoles, each consisting of a +10-uC charge and a -10-uC charge, are located in the xy-plane with their centers 1.0 mm from the origin, as shown. A sphere passes through the dipoles, as shown in the figure. what is the electric flux through the sphere due to these dipoles?

a)

(4.5 x 10^6) Nm^2/C

b)

0 Nm^2/C

c)

(9.0 x 10^6) Nm^2/C

d)

(11 x 10^5) Nm^2/C

7.

A charge Q is uniformly spread over one surface of a very large nonconducting square elastic sheet having sides of length d. At a point P that is 1.25 cm outside the sheet, the magnitude of the electric field to the sheet is E. If the sheet is now stretched so that its sides have length 2d, what is the magnitude of the electric field at P?

a)

4E

b)

2E

c)

E

d)

E/2

e)

E/4

8.

Two identical small charged spheres are certain distance apart, and each one initially experiences an electrostatic force of magnitude F due to the other. With time, charge gradually leaks off of both spheres. When each of the spheres has lost half its initial charge, the magnitude of the electrostatic force will be:

a)

1/16 F

b)

1/8 F

c)

1/4 F

d)

1/2 F

9.

One very small uniformly charged plastic ball is located directly above another such charge in a test tube as shown in the figure. That balls are in equilibrium a distance d apart. If the charge on each ball is doubled, the distance between the balls in the test tube would become

a)

2d\sqrt[]{2}d

b)

2d

c)

4d

d)

8d

10.

When two point charges are a distance d apart, the electric force that each one feels from the other has magnitude F. In order to make this force twice as strong, the distance would have to be changed to:

a)

2d

b)

2d\sqrt[]{2d}

c)

d/ 2\sqrt[]{2}

d)

d/2

e)

d/4

11.

Two point charges Q1 and Q2 of equal magnitudes and opposite signs are positioned as shown in the figure. which of the arrows best represents the net electric field at point P due to these two charges?

a)

A

b)

B

c)

C

d)

D

12.

A 1.0-C point charge is 15m from a second point charge, and the electric force on one of them due to the other is 1.0 N. What is the magnitude of the second charge?

a)

25 C

b)

1.0 C

c)

10 nC

d)

0.025 C

e)

25 nC

13.

if there is a positive charge at the origin and a negative charged located on the negative x-axis at (-1.0m, 0.0), what is the direction of the force ON the NEGATIVE charge?

a)

-x

b)

+x

c)

+y

d)

-y

e)

The force is 0

14.

Two long straight parallel lines, #1 and #2, carry uniform positive linear charge densities. The charge density on line #2 is twice as great as the charge density on line #1. The locus of points where the electric field due to these lines is zero is

a)

along a line between the lines closer to line #2 than line #1.

b)

at a point midway between the lines

c)

along a line perpendicular to lines #1 and #2.

d)

along a line between the lines closer to line #1 than line #2.

15.

An uncharged conductor has a hollow cavity inside of it. Within this cavity there is a charge of +10 uC that does not touch the conductor. There are no other charges in the vicinity. Which statement about this conductor is true?

a)

The inner surface of the conductor carries a charge of -10 uC and its outer surface carries no excess charge.

b)

The inner and outer surfaces of the conductor each contain charges of -5 uC.

c)

The net electric field within the material of the conductor points away from the +10 uC charge.

d)

The outer surface of the conductor contains +10 uC of charge and the inner surface contains -10 uC.

e)

Both surfaces of the conductor carry no excess charge because the conductor is uncharged.

16.

If the electric flux through a closed surface is zero, the electric field at points on that surface must be zero.

a)

True

b)

False

17.

Under electrostatic conditions, the electric field just outside the surface of any charged conductor

a)

is always parallel to the surface

b)

is always zero because the electric field is zero inside the conductors

c)

is always perpendicular to the surface of the conductor

d)

can have nonzero components perpendicular to and parallel to the surface of the conductor.

18.

If a rectangular area is rotated in a uniform electric field from the position where the maximum electric flux goes through it to an orientation where only half the flux goes through it, what has been the angle of rotation?

a)

90°

b)

30°

c)

60°

d)

45°

e)

0°

19.

A charge of 1.0 x 10^-6 uC is located inside a sphere, 1.25 cm from its center. What is the electric flux through the sphere due to this charge?

a)

(0.11) Nm^2/C

b)

(8.9) Nm^2/C

c)

(0.028pi) Nm^2/C

d)

0

20.

The figure shows three electric charges labeled Q1, Q2, Q3, and some electric field lines in the region surrounding the charges. what are the signs of the three charges?

a)

Q1 is positive, Q2 is negative, Q3 is positive.

b)

Q1 is negative, Q2 is positive, Q3 is negative

c)

Q1 is positive, Q2 is positive, Q3 is negative.

d)

All three charges are NEGATIVE

e)

All three charges are POSITIVE.

21.

A piece of plastic has a net charge of +2.00 uC. How many more protons than electrons does this piece of plastic have?

a)

1.25 x 10^13

b)

1.25 x 10^19

c)

2.50 x 10^13

d)

2.50 x 10^19

22.

A metal ball hangs from the ceiling by an insulating thread. The ball is attracted to a positive-charged rod held near the ball. The charge of the ball must be:

a)

Positive or neutral

b)

Negative or neutral

c)

Negative

d)

neutral

23.

You are sitting a certain distance from a point charge, and you measure an electric field of E. If the charge is doubled and your distance from the charge is ALSO doubled, what is the electric field strength now?

a)

E

b)

E/2

c)

e/4

d)

2E

e)

4E

24.

A proton and an electron are in a constant electric field created by oppsoitely charged plates. You release the proton from the positive side and the electron from the negative side. which feels the larger electric force?

a)

electron

b)

proton

c)

they feel the same magnitude force but opposite direction

d)

they feel the same magnitude force but same direction

25.

Two balls with charges +Q and -4Q are fixed at a separation distance of 3R. Is it possible to place another charged ball Q0 anywhere on the line such that the net force on Q0 will be zero?

a)

No, the net force can never be zero

b)

Yes, independent of the sign (or value) of Q0

c)

Yes, but only if Q0 is negative.

d)

Yes but only if Q0 is positive.

26.

When two or more capacitors are connected in parallel across a potential difference

a)

the potential difference across each capacitor is the same

b)

Each capacitor carries the same amount of charge

c)

the equivalent capacitance of the combination is less than the capacitance of any of the capacitors

d)

All of the above are correct.

e)

None of the above are correct.

27.

Four arrangements of capacitors are pictured., each has an equivalent capacitance. Rank these four arrangements from highest equivalent capacitance to lowest. Assume that all capacitors are identical.

a)

B > C > A > D

b)

C > D > A > B

c)

A > B > C > D

d)

A > C > B > D

e)

D > C > B > A

28.

Which two points have the same potential?

a)

A and C

b)

B and D

c)

B and E

d)

C and E

29.

As an electron moves in the direction of the electric field lines

a)

it is moving from low potential to high potential and losing electric potential energy

b)

it is moving from high potential to low potential and gaining electric potential energy

c)

it is moving from high potential to low potential and losing electric potential energy

d)

it is moving from low potential to high potential and gaining electric potential energy

e)

both its electric potential and electric potential energy remain constant.

30.

How much work must we do on an electron to move it from point A, which is a ta potential of +50 V, to point B, which is at a potential fo -50V ,along the semicircular path shown in the figure? Assume the system is isolated from outside forces. (e = 1.60 x 10^-19 C)

a)

1.6 J

b)

-1.60 x 10^-17 J

c)

1.60 x 10^-17 J

d)

-1.6 J

e)

This cannot be determined because we do not know the distance traveled.

31.

How much KE does a proton gain if it is accelerated, through 1.00 V?

a)

1.00 eV

b)

-1.00 eV

c)

1837 eV

d)

-1836 eV

32.

The electron volt is a unit of

a)

energy.

b)

electric potential.

c)

electric field.

d)

electric force.

e)

charge.

33.

A region of space contains a uniform electric field, directeds toward the right, as shown in the figure. which statement about this situation is correct?

a)

The potential at all 3 locations is the same

b)

The potentials at points A and B are equal, and the potential at point C is higher than the potential at point A.

c)

The potential at point A is the highest, the potential at point B is the second highest, and the potential at point C is the lowest.

d)

The potential at points A and B are equal, and the potential at point C is lower than the potential at point A.

34.

A 12 micro-Farad capacitor and a 6 micro-Farad capacitor are connected together as shown. if the charge on the 12 micro-Farad capacitor is 24 microcoloumbs, what is the charge on the 6 micro-farad capacitor?

a)

24 uC

b)

12 uC

c)

36 uC

d)

48 uC

35.

A 12 micro-Farad capacitor and a 6 micro-farad capacitor are connected together as shown. If the charge on the 12 micro-Farad capacitor is 24 uC what is the charge on the 6 micro-Farad capacitor?

a)

24 uC

b)

12 uC

c)

36 uC

d)

48 uC

36.

If the electrical potential in a region is constant, the electric field must be 0 everywhere in that region.

a)

True

b)

False

37.

Under electrostatic conditions, the electric field just outside the surface of any charged conductor

a)

is always parallel to the surface

b)

is always perpendicular to the surface of the conductor.

c)

is always zero because the electric field is zero inside conductors.

d)

can have nonzero components perpendicular to and parallel to the surface of the conductor.

38.

A proton and an electron are in a constant electric field created by oppositely charged plates. You release the proton from the positive side and the electron from the negative side. Which feels the larger electric force?

a)

Neither - there is no force

b)

The electron

c)

The proton

d)

They feel the same magnitude force, in the same direction

e)

They feel the same magnitude force, in opposite directions

39.

When a negative charge moves opposite to the direction of the electric field, increases

a)

The field does negative work on it and the potential energy increases.

b)

The field does negative work on it and the potential energy decreases.

c)

The field does positive work on it and the potential energy decreases.

d)

The field does zero work on it and the potential energy remains constant.

40.

Which is true about the surface of a charged conductor in which no charge is moving?

a)

the electric field is zero at the surface

b)

The electric potential is constant over the surface.

c)

The electric potential of the surface is zero

d)

The electric field is constant at the surface

41.

When a positive charge moves perpendicular to the direction of the electric field,

a)

the field does positive work on it and the potential energy increases.

b)

the field does zero work on it and the potential energy remains constant.

c)

the field does negative work on it and the potential energy decreases.

d)

the field does negative work on it and the potential energy increases.

42.

Three capacitors are in parallel with each other. what can be said for certain about the total capacitance?

a)

The total capacitance is the average of the individual capacitances.

b)

The total capacitance is greater than any of the individual capacitances.

c)

The total capacitance is less than any of the individual capacitances.

d)

The total capacitance is somewhere between the highest capacitance and the lowest capacitance (inclusive)

43.

Where an electric field lines crosses an equipotential surface, the angle between the field line and the equipotential surface is

a)

Zero

b)

90 degrees

c)

180 degrees

d)

Between zero and 90 degrees

44.

If it takes an amount of work W to move two +q point charges from infinity to a distance d apart from each other, then how much work would it take to move three +q point charges from infinity to a distance d apart from each other?

a)

2W

b)

3W

c)

4W

d)

6W

45.

two identical positive charges are near each other. At the point halfway between the two charges +y direction

a)

Th electric field is zero, and the potential is positive

b)

The electric field is zero, the potential is zero

c)

the electric field is not zero, and the potential is positive

d)

The electric field is not zero, and the potential is zero.

46.

A negative charge, if free, will tend to move

a)

from high potential to low potential

b)

from low potential to high potential

c)

in the direction of the electric field

d)

toward infinity

47.

Suppose you have two point-charges of opposite sign. As you move them farther and farther apart, the potential energy of this system relative to infinity

a)

Decreases

b)

increases

c)

Stays the same

d)

Is always zero

48.

you want to connect a 12 uF capacitor and a 6 uF capacitor. How should you connect them so that when the capacitors are charged, the 12 uF capacitor will have a greater amount of stored energy than the 6 uF capacitor?

a)

The two capacitors should be in parallel.

b)

The two capacitors should be in series

c)

The connection should be neither series nor parallel

d)

This is impossible no amtter how the cpacaitors are connected.

49.

What is the direction of the electric potential gradient at a certain point?

a)

The same as the direction of the electric field at that point

b)

perpendicular to the direction of the electric field at that point

c)

at an angle other than 0°, 90°, or 180° from the direction of the electric field at that point

d)

opposite to the direction of the electric field at that point

e)

none of the above

50.

A solid sphere conductor has a spherical cavity in its interior. If there is a net positive charge on the conductor, what is the electric potential in the cavity?

a)

Zero

b)

Non-zero and points inward

c)

Non-zero and points outward

d)

Uniform and non-zero.

51.

The Circuit is constructed as shown. Initially the switch was set to position a (battery in series with resistor and capacitor) and then after a long time, it was then set to position b. If, after the switch was set to position b one was to measure the current across the resistor, how would it change in time?

a)

Decreases exponentially

b)

Increases exponentially

c)

Stays constasnt

d)

Decreases at a constant rate

e)

Increases at a constant rate

52.

The figure shows three identical lightbulbs connected to a battery having a constant voltage across its terminals. What happens to the brightness of lightbulb 1 when the switch S is closed?

a)

The brightness will increase momentarily then return to its previous level.

b)

The brightness increases permanently

c)

The brightness will decrease momentarily then return to its previous level

d)

The brightness remains the same as before the switch is closed.

e)

The brightness decreases permanently.

53.

In the circuit shown in the figure all the lightbulbs are identical. Which of the following is the correct ranking of the brightness of the bulbs?

a)

B and C have equal brightness and A is the dimmest

b)

A and B have equal brightness and C is the dimmest

c)

A is brightest c is dimmest and B is in between

d)

A is the brightest, and B and C have equal brightness but less than A

e)

All three bulbs have the same brightness

54.

As more resistors are added in parallel across a constant voltage source, the power supplied by the source

a)

increases

b)

decreases

c)

does not change

55.

The figure depicts a complete circuit with two resistors, R1 and R2, which are unequal in value (R1 has a different resistance than R2). Which of the following statements is true concerning these resistors?

a)

The largest resistance has the largest current through it.

b)

The potential drop is always the same across each resistor.

c)

The power generated in each resistor is the same.

d)

The same current always runs through each resistor

56.

For a constant voltage source applied across the left side of the circuit (open circles), as the number of resistors is increased, which of the following increases?

a)

Power supplied by the source.

b)

Equivalent resistance

c)

Resistance of each individual resistor.

d)

Voltage across each resistor.

e)

No quantity listed increases.

57.

Which of the following represents the power supplied from the battery?

a)

P=I2RP=I^2R

b)

P=V2RP=\frac{V^2}{R}

c)

P=IRP=IR

d)

P=VRP=\frac{V}{R}

e)

P=IVP=IV

58.

Three identical resistors, each of resistance R, are connected as shown. what is the equivalent resistance of this arrangements of three resistors?

a)

3R

b)

2R

c)

3R/2

d)

2R/3

e)

R/3

59.

Which resistors are in parallel?

a)

R1 and R2

b)

R1 and R3

c)

R2 and R3

d)

All three are in parallel

e)

None of the answers are correct.

60.

Which resistor has the greatest current going through it? Assume all resistors are equal.

a)

R5

b)

R1

c)

R1 and R2

d)

R3 and R4

e)

All of them are the same.

61.

Which of the two arrangements shown has the smaller equivalent resistance: a set of resistors in series, or the same set of resistors in parallel?

a)

The parallel arrangement

b)

The series arrangement

c)

The equivalent resistance is the same for both arrangements

d)

The answer depends on the values of the individual resistances

62.

If a 4 ohm and 2 ohm resistor are connected in series with a 12 v battery, what is the voltage drop across the 4 ohm resistor?

a)

4 V

b)

6 V

c)

8 V

d)

12 V

63.

What is the time constant for an RC circuit?

a)

1/RC

b)

Q/V

c)

CV

d)

RC

64.

When charging a capacitor in an RC circuit, how does the current change with time?

a)

Increases exponentially

b)

Decreases exponentially

c)

Stays constant

d)

Decreases at a constant rate

e)

Increases at a constant rate

65.

In the circuit shown in the figure, four identical resistors labeled A to D are connected to a battery as shown. S1 and S2 are switches. Which of the following actions would result in the GREATEST amount of current through resistor A?

a)

Closing S1 only

b)

Closing S2 only

c)

Closing both switches S1 and S2

d)

leaving both S1 and S2 open

66.

Kirchoff's loop rule is a statement of

a)

The law of conservation of angular momentum

b)

The law of conservation of charge.

c)

Newton's second law.

d)

The law of conservation of energy.

e)

The law of conservation of momentum.

67.

An ideal ammeter should

a)

introduce a very large series resistance into the circuit whose current is to be measured.

b)

consist of a galvanometer in series with a large resistor.

c)

introduce a very small series resistance into the circuit whose current is to be measured.

d)

have a high coil resistance.

68.

You wish to study a resistor in a circuit. To simultaneously measure the current in the resistor and the voltage across the resistor, you would place

a)

an ammeter in series and a voltmeter in series

b)

an ammeter in parallel and a voltmeter in series

c)

an ammeter in series and a voltmeter in parallel

d)

an ammeter in parallel and a voltmeter in parallel

69.

When connected to a battery, a light bulb glows brightly. If the battery is reversed and reconnected to the bulb, the bulb will glow

a)

Not at all

b)

The same

c)

Brighter

d)

Dimmer

70.

In what direction does electron current flow?

a)

Perpendicular to the E-field

b)

With the E-field

c)

Against the E-field

d)

From high to low potential

71.

When a current flows through a metal wire, the moving charges are

a)

Negative ions

b)

Only protons

c)

Positive ions

d)

Only electrons

e)

Both protons and electrons

72.

When unequal resistors are connected in parallel ina circuit,

a)

the potential drop is always the same across each resistor.

b)

the largest resistance has the largest current through it.

c)

the power generated in each resistor is the same.

d)

the same current always runs through each resistor.

73.

Four unequal resistors are connected in series with eachother. Which one of the following statements is correct about this combination?

a)

The equivalent resistance is more than the largest resistance

b)

The equivalent resistance is less than that of the smallest resistor.

c)

The equivalent resistance is less than that of the largest resistor

d)

The equivalent resistance is equal to that of any one of the resistors

e)

The equivalent resistance is equal to average of the four resistances.

74.

A 9-V battery is hooked up to two resistors in series. One has a resistance of 5Ω5\Omega , and the other has a resistance of 10Ω10\Omega . Through which resistor is energy being dissipated at the higher rate?

a)

The energy being dissipated by both resistors is the same

b)

The 5 Ohm resistor

c)

The 10 Ohm resistor

75.

When DISCHARGING a capacitor in a RC circuit, how does the current change with time?

a)

Increases exponentially

b)

Decreases exponentially

c)

Stays constant

d)

Decreases at a constant rate

e)

Increases at a constant rate

76.

A vertical wire carries a current straight down. To the east of this wire, the magnetic field points

a)

Toward the north

b)

toward the east

c)

toward the west

d)

toward the south

e)

downward

77.

The figure shows two long wires carrying equal currents I1 and I2 flowing in opposite directions. which of the arrows labeled A through D correctly represents the direction of the magnetic field due to the wires at a point located at an equal distance d from each other?

a)

A

b)

B

c)

C

d)

D

78.

A negatively charged particle is moving to the right, directly above a wire having a current flowing to the right, as shown in the figure. In which direction is the magnetic force exerted on the particle?

a)

Into the page

b)

Out of the page

c)

downward

d)

upward

e)

The magnetic field is zero.

79.

A new particle has been discovered. If the particle moves in direction of the +x-axis while entering a uniform magnetic field, oriented in the -z-direction, it will experience a deflection. if the particle was negative, in what direction would you expect the deflection to be in?

a)

+y-direction

b)

-y-direction

c)

+z-direction

d)

-z-direction

e)

-x-direction

80.

A magnetic field is detected in a region of space, and it is thought to be uniform in that region. In order to determine the direction of the magnetic field, scientists shoot a beam of electrons through the field directed westward. If the electrons were defected in the upward direction, in what direction would you expect the magnetic field to be?

a)

Upward

b)

Downward

c)

North

d)

South

e)

East

81.

A uniform magnetic field is oriented out of the page (as show in the figure) in a region in space. researchers wish to release three particles and want them to follow the paths shown above (1, 2, 3) in that order. All particles will be released from the same location with the same initial velocity. The particles they wish to release are an electron, a proton, and a neutron. In what order should they release them?

a)

neutron, proton, electron

b)

neutron, electron, proton

c)

electron, neutron, proton

d)

electron, proton, neutron

e)

proton, neutron, electron

82.

A particle enters a magnetic field, traveling North. The particle is known to be a proton. The proton experiences a force from the magnetic field and as a result, curves downward. It must be the case that the external magnetic field has a non-zero component along what direction?

a)

Upward

b)

downward

c)

eastward

d)

Westward

83.

A researcher wishes to have a particle, initially moving in the +y-direction, to experience a force in the -x-direction. She has two different particles to choose from:

Particle A is attracted to a positively charged object,

Particle B is attracted to a negatively charged object,

If the researcher selects particle A, in what direction would she orient a uniform magnetic field to achieve the desired effect?

a)

+z-direction

b)

-z-direction

c)

-y-direction

d)

+x-direction

84.

Two particles, initially travelling in the +x-direction, enter a uniform magnetic field directed along the +y-direction

Particle A experiences an upward deflection (+z-direction)

Particle B experiences a downward deflection (-z-direction)

Which of particles A or B, would be REPELLED by the charges which flow through a metal wire as a current

a)

Particle A

b)

Particle B

c)

Both Particle A and B would be repelled

d)

Neither would be repelled

85.

When a charged particle moves through a magnetic field, the direction of the magnetic force on the particle at a certain point

a)

is in the direction of the magnetic field at that point

b)

is perpendicular to the magnetic field at that point

c)

is opposite to the direction of the magnetic field at that point

d)

depends on the mass of the particle

86.

Two very long parallel wires are a distance d apart and carry equal currents in oppsoite directions. The locations where the net magnetic field due to these currents is equal to zero are:

a)

midway between the wires

b)

a distance d/2 to the left wire and also a distance d/2 to the right of the right wire

c)

a distance d to the left of the wire and also a distance d to the right of the right wire

d)

a distance d2\frac{d}{\sqrt[]{2}} to the left of the left wire and also a distance d2\frac{d}{\sqrt[]{2}} to the right of the right wire.

e)

The net field is not zero anywhere

87.

Ions having equal charges but masses of M and 2M are accelerated through the same potential difference and then enter a uniform magnetic field perpendicular to their path. If the heavier ions follow a circular arc of radius R, what is the radius of the arc followed by the lighter?

a)

4R

b)

3R

c)

2R\sqrt[]{2}R

d)

R2\frac{R}{\sqrt[]{2}}

e)

R/2

88.

A vertical wire carries a current vertically upward in a region where the magnetic field vector points toward the north. what is the direction of the magnetic force on this current do to the field?

a)

Downward

b)

North

c)

South

d)

East

e)

West

89.

The figure shows three long, parallel current-carrying wires. The magnitudes of the currents are equal and their directions are indicated in the figure. Which of the arrows drawn near the wire carrying current 1 correctly indicates the direction of the magnetic force acting on that wire.

a)

A

b)

B

c)

C

d)

D

90.

The figure shows three long, parallel, current-carrying wires. The current directions are indicated for currents I1 and I3. The arrow labeled F represents the net magnetic force acting on current I3. The three currents have equal magnitudes. what is the direction of the current I2?

a)

Into the page

b)

to the right

c)

upward

d)

downward

e)

out of the page

91.

A long straight conductor has a constant current flowing to the right. A wire rectangle is situated above the wire, and also has a constant current flowing through it (as shown in the figure). Which of the following statements is true?

a)

The net force on the rectangle is upward, and there is a net torque on it

b)

The net force on the rectangle is zero, and the net torque on it is zero

c)

The net force on the rectangle is downward, and there is a net torque on it

d)

The net force on the rectangle is zero, but there is a net torque on it

e)

The net force on the rectangle is downward, and the net torque on it is zero.

92.

A ring with a clockwise current (as seen from above the ring) is situated with its center directly above another ring, which has a counter-clockwise current, as shown in the figure. In what direction is the net magnetic force exerted on the top ring?

a)

Upward

b)

Downward

c)

To the right

d)

To the left

e)

The net force is zero

93.

The figure shows four different sets of insulated wires that cross each other at right angles without making electrical contact. The magnitude of the current is the same in all the wires, and the directions of current flow are as indicated. For which (if any) configuration will the magnetic field at the center of the square formed by the wires be equal to zero? Select E if none of the configurations are correct.

a)

A

b)

B

c)

C

d)

D

e)

E (none are correct)

94.

A current carrying loop of wire lies flat on a table top. When viewed from above, the current moves around the loop in a counterclockwise sense. For points OUTSIDE the loop, the magnetic field caused by this current

a)

circles the loop in a clockwise direction.

b)

circles the loop ibn a counterclockwise direction

c)

points straight up.

d)

points straight down.

e)

is zero.

95.

A current carrying loop of wire lies flat on a table top. When viewed from above, the current moves around the loop in a counterclockwise sense. For points INSIDE the loop, the magnetic field caused by this current

a)

circles the loop in a clockwise direction

b)

circles the loop in a counterclockwise direction

c)

points straight up

d)

points straight down

e)

is zero.

96.

Consider a solenoid of length L, N windings, and radius b (L is much longer than b). A current I is flowing through the wire. If the radius of the solenoid were doubled (becoming 2b), and all other quantities remained the same, the magnetic field inside the solenoid would

a)

Remain the same.

b)

Become twice as strong.

c)

Become one half as strong.

97.

Consider a solenoid of length L, N windings, and radius b (L is much longer than b). A current I is flowing through the wire. If the length of the solenoid were doubled (2L), and all other quantities remained the same, the magnetic field inside the solenoid would

a)

Remain the same.

b)

Become twice as strong.

c)

Become on half as strong.

98.

A proton beam enters into a magnetic field region as shown. what is the direction of the magnetic field b?

a)

Into the page

b)

Out of the page

c)

+y

d)

-y

e)

+x

99.

A proton enters a uniform magnetic field that is perpendicular to the proton's velocity. What happens to the kinetic energy of the proton?

a)

It increases

b)

It decreases

c)

It stays the same

d)

It becomes zero

100.

A wire consists of two straight sections with a semicircular section between them. If current flows in the wire as shown, what is the direction of the magnetic field at P due to the current?

a)

Into the page

b)

Out of the page

c)

To the left

d)

To the right

e)

Up

101.

How must you move the magnet in order to make the light bulb glow?

a)

Place it within the solenoid.

b)

Move it throughout the solenoid.

c)

Place it on the light bulb.

d)

Move the magnet perpendicular to the solenoid

102.

When you place a bar magnet in space, the magnetic field lines will

a)

Travel outwards from both ends

b)

Travel out of the North pole and into the South pole

c)

Travel out of the South pole and into the North pole

d)

Travel inwards from both ends.

103.

When you place a compass next to a bar magnet, in which direction will the compass (red arrow) point toward?

a)

In the direction of the magnetic field lines.

b)

Opposite to the direction of the magnetic field lines.

c)

Parallel to the bar magnet everywhere.

d)

Perpendicular to the bar magnet everwhere.

104.

How might using AC Current in an electromagnet affect a compass placed nearby?

a)

The compass will spin at a constant rate.

b)

The direction of the compass stays constant, regardless of the frequency.

c)

The direction of the compass points perpendicular to the coil

d)

The magnet flips direction periodically, cycling with the current

105.

For an AC source with a single resistor (that's the entire circuit), what is the relationship between the instantaneous current i through the resistor and the instantaneous voltage Vab across the resistor?

a)

i is maximum at the same time as Vab.

b)

i is maximum one-quarter cycle after Vab

c)

I is maximum one-quarter cycle before Vab

d)

All are possible depending on the circumstances

106.

For an AC source with a single inductor (that's the entire circuit), what is the relationship between the instantaneous current i through the resistor and the instantaneous voltage vab across the resistor?

a)

i is maximum at the same time as Vab.

b)

i is maximum one-quarter cycle before Vab.

c)

i is maximum one-quarter cycle after Vab.

d)

All are possible depending on the circumstances.

107.

For an AC source with a single capacitor (that's the entire circuit), what is the relationship between the instantaneous current i through the resistor and the instantaneous voltage vab across the resistor?

a)

i is maximum on quarter-cycle after Vab.

b)

i is maximum one-quarter cycle before Vab.

c)

i is maximum at the same time as Vab.

d)

All are possible depending on the circumstances.

108.

An oscillating voltage of fixed amplitude is applied across a circuit element. If the frequency of this voltage is increased, the amplitude of the current will

a)

decrease if the circuit element is an inductor, but increase if the circuit element is a capacitor

b)

increase if the circuit element is either an inductor or a capacitor.

c)

decrease if the circuit element is either an inductor or a capacitor

d)

increase if the circuit element is an inductor, but decrease if the circuit element is a capacitor.

109.

A series RL circuit is driven by an ac source with a voltage amplitude of 70.0 V and an angular frequency of 200 rad/s the resistance is 300 and the inductance is 0.600 H.

Calculate the phase angle for this circuit in degrees.

a)

0.381

b)

21.8

c)

1.19

d)

83.3

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