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PHY 204 Concept questions

Total questions: 77

Worksheet time: 6hrs 25mins

Name
Class
Date
1.

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

e)

The field is equal to zero at point P

2.

An electron is initially moving to the right when it enters a uniform electric field directed upwards. which trajectory shown below will the electron follow?

a)

W

b)

X

c)

Y

d)

Z

3.

A point charge Q is located a short distance from a point charge 3Q and no other charges are present. If the electrical force on Q is F what is the electric force on 3Q?

a)

F/3

b)

F/ 3\sqrt[]{3}  

c)

F

d)

3F\sqrt[]{3}F  

e)

3F

4.

consider a spherical gaussian surface of radius R centered at the origin. a charge Q is placed inside the sphere. to maximize the magnitude of the flux of the electric field through the Gaussian surfaces, the charge should be located...

a)

at x=0,y-0,z=R/2

b)

at the origin

c)

at x=R/2,y=0,z=0

d)

at x=0,y=R/2,z=0

e)

the charge can be located anywhere since flux does not depend on the position of the charge as long as its inside the sphere.

5.

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 conductors

c)

is always perpendicular to the surface of the conductor

d)

is perpendicular to the surface of the conductor only if it is a sphere, a cylinder, or a flat sheet

6.

the figure shows 4 gaussian surfaces sourrpunding a distribution of charges. which gaussian surfaces have an electric flux of +q/ ϵ0\epsilon0  through them?

a)

a

b)

b

c)

c

d)

d

7.

when the electric field is zero at a point the potential must be zero there

a)

true

b)

false

8.

if the electric potential in a region is constant the electric field must me zero everywhere in that region

a)

true

b)

false

9.

if the electric field is zero everywhere inside a region of space, the potential must also be zero in that region.

a)

true

b)

false

10.

a negative charge of free will tend to move...

a)

from high potential to low potential

b)

from low potential to heigh potential

c)

towards infinity

d)

away from infinity

e)

in the direction of the electric field

11.

suppose a region of space has a uniform electric field, directed towards the right. which statement about the electric potential is true?

a)

the potential at all three locations(ABC) is the same because the field is uniform.

b)

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

d)

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

12.

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)

increases

b)

decreases

c)

stays the same

13.

suppose you have two negative point charges. as you move them further and further apart the potential energy of this system relative to infinity...

a)

increases

b)

decreases

c)

stays the same

14.

two equal positive charges are held in place at a fixed distance. if you put a third positive charge midway between these two charges its electrical potential energy of the system (relative to infinity) is zero because the electrical forces on the third charge due to the fixed charges just balance each other.

a)

True

b)

False

15.

a metallic sphere of radius 5 cm is charged such that the potential of its surface is 100 V (relative to infinity). which of the following plots correctly shows the potential as a function of distance from the center of the sphere?

a)
b)
c)
d)
16.

A conducting sphere of radius R carries an excess positive charge and is very far from any other charges. which one of the following graphs best illustrates the potential (relative to infinity) produced by this sphere as a function of the distance r from the center of the sphere?

a)
b)
c)
d)
e)
17.

a conducting sphere contains positive charge distributed uniformly over its surface. which statements about the potential due to this sphere are true? all potentials are measured relative to infinity.

a)

the potential is lowest, but not zero, at the center of the sphere

b)

the potential at the center of the sphere is zero

c)

the potential at the center of the sphere is the same as the potential at the surface

d)

the potential at the surface is higher than the potential at the center

e)

the potential at the center is the same as the potential at infinity

18.

a negative charge is moved from point A to point B along an equipotential surface. which of the following statements must be true in this case?

a)

the negative charge performs work in moving from point A to B

b)

work is required to move the negative charge from point A to B

c)

no work is required to move the negative charge from point A to B

d)

the work on the charge depends on the distance between A and B

e)

work is done in moving the negative charge from point A to B

19.

the charge on the square plates of a parallel-plate capacitor is Q. the potential across the plates is maintained with constant voltage by a battery as they are pulled apart to twice their original separation, which is small compaired to the dimentions of the plates. the amount of charge on the plates is now...

a)

4Q

b)

2Q

c)

Q

d)

Q/2

e)

Q/4

20.

when two or more capacitors are connected in series across a potential difference...

a)

the potential difference across the combination is the algebraic sum of the potential differences across the individual capacitors

b)

each capacitor carries the same amount of charge

c)

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

d)

all the choices are correct

e)

none of the choices are correct

21.

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 choices are correct

e)

none of the choices are correct

22.

an ideal air-filled parallel plate capacitor has round plates and carries a fixed amount of equal but opposite charge on its plates. the separation is now doubled. if the original capacitance was Co what is the new capacitance?

a)

4Co

b)

2Co

c)

Co

d)

Co/2

e)

Co/4

23.

an ideal air-filled parallel plate capacitor has round plates and carries a fixed amount of equal but opposite charge on its plates. all the geometric parameters of the capacitor (plat diameter and plate separation) are now doubled. if the original capacitance was Co what is the new capacitance?

a)

4Co

b)

2Co

c)

CO

d)

CO/2

e)

Co/4

24.

a cylindrical wire has a resistance R and resistivity ρ\rho  . if its length and diamityer are both cut in half what will be its resistivity?

a)

4 ρ\rho  

b)

2 ρ\rho  

c)

ρ\rho  

d)

ρ\rho  /2 

e)

ρ\rho  /4

25.

a cylindrical wire has a resistance R and resistivity ρ\rho  . if its length and diamityer are both cut in half what will be its resistance?

a)

4 R

b)

2R 

c)

R 

d)

R /2 

e)

R /4

26.

a wire of resistivity ρ\rho  must me replaced in a curcuit by a wirer of the same material but 4 times as long. if however the resistance of the new wire is to be the same as the resistance of the original wire the diameter of the new wire must be...

a)

the same

b)

1/2 times

c)

1/4 times

d)

2 times

e)

4 times

27.

as current flows through a uniform wire the wire gets hotter because the electrons stop moving and therefore transform their lost kinetic energy into thermal energy in the wire

a)

true

b)

false

28.

when a potential difference of 10V is places across a certain solid cylindrical resistor the curent through it is 2A. if the diameter of this resistor is now trippled the current will be...

a)

2/9A

b)

2/3A

c)

2A

d)

3A

e)

18A

29.

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

30.

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 Leven

b)

the brightness increases permanently

c)

the brightness will decrease momentarily then return to its previous level

d)

the brightness will remain the same as before the switch is closed

e)

the brightness decreases permanently

31.

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 brightnesses and A is the dimmest

b)

A and B have equal brightness and C is the dimest

c)

A is brightest and C is dimmest and B is in-between

d)

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

e)

all three bulbs have the same brightness

32.

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 both switches

b)

closing S1 only

c)

closing S2 only

d)

leaving both switches open as swom

33.

a resistor is made out of a large long wire having length L. each end of the wire is attached to a terminal of battery providing a constant voltage Vo. a current I flows through the wire. if the wire were cut in half, making two wires of length L/2 and both wires were attached to the battery (the end of both wires attached to one terminal and the other ends attached to the other) what would be the total current flowing through the two wires?

a)

4I

b)

2I

c)

I

d)

I/2

34.

a light bulb is connected in the circuit shown in the figure with switch S open. all the connecting leads have no appreciable resistance and the battery has no internal resistance. when we close the switch, which statements below accurately describe the behavior of the circuit? (there may be more than one correct choice)

a)

the brightness of the bulb will increase

b)

the brightness of the bulb will decrease

c)

the brightness of the bulb will not change

d)

the potential drop across R2 will decrease

e)

the potential drop across R2 will not change

35.

two light bulbs B1 and B2 are connected to a battery having appreciable internal resistance as shown in the figure. what happens to the brightness of the bulb B1 when we close the switch S

a)

the brightness of B1 increases permanently

b)

the brightness of B1 decreases pernanently

c)

the brightness of B1 does not change

d)

the brightness of B1 increases temporarily but gradually decreases back to its original brightness

e)

the brightness of the B1 decreases temporarily but gradually increases back to its original brightness

36.

a resistor and a capacitor are connected in series across an ideal battery having a constant voltage across its terminals. at the moment contact is made with the battery the voltage across the capacitor is...

a)

equal to the battery's terminal voltage

b)

less then the battery's terminal voltage but less than zero

c)

greater than the battery's terminal

d)

zero

37.

a light bulb is connected in the ciruit show in the figue with the swich S open and the capacitor uncharged. the battery has no appreciable internal resistance. which one of the following graphs best describes the brightness B of he bulb as a finction of time t after closing the swich?

a)
b)
c)
d)
e)
38.

a resistor and a capacitor are connected in series across an ideal battery having a constant voltage across its terminals. at the moment contact is made with the battery the voltage across the resistor is...

a)

greater than the battery's terminal voltage

b)

less than the battery's terminal voltage but greater than zero

c)

equal to the battery's terminal voltage

d)

zero

39.

a virtical wire carries a current straight down. to the east of this wire the magnetic field points...

a)

north

b)

east

c)

west

d)

south

e)

downwards

40.

a current-carrying loop of wire lies flat on a tabletop. when viewed from above, the current moves around the loop in a counterclockwise sense. for points outside the loop and on the table 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

41.

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 loops and on the table, the magnetic field cause by the 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

42.

a horizontle wire carries a current straight towards you. from your point of view, the magnetic field at a point directly below the wire points...

a)

directly away from you

b)

to the left

c)

to the right

d)

directly towards you

e)

vertically upwards

43.

an electron moving in the direction of the +x axis enters a magnetic field. if the electron experiences a magnetic deflection in the -y direction, the direction of the magnetic field in this region pints in the direction of the...

a)

+z axis

b)

-z axis

c)

-x axis

d)

+y axis

e)

-y axis

44.

an electron, moving toward the west, enters a uniform magnetic field. because of this field the electron curves upwards. the direction of the magnetic field is...

a)

towards the north

b)

towards the south

c)

towards the west

d)

upwards

e)

downwards

45.

two long parallel wires placed side-by-side on a horizontal table carry identiacal size currents in opposite directions. the wire on your right carries current toward you, and the wire on your left carries current away from you from your point of view, the magnetic field at the point exactly midway between the two wires...

a)

points upwards

b)

points downwards

c)

points toward you

d)

points away from you

e)

is zero

46.

three particals travel through a region of space where the magnetic field is out of the page, as shown in the figure. the electric charge of each of the three particals is, respectively...

a)

1 is neutral, 2 is negative, and 3 is positive

b)

1 is neutral, 2 is positive, and 3 is negative

c)

1 is positive, 2 is neutral, and 3 is negative

d)

1 is positive, 2 is negative, and 3 is neutral

e)

1 is negative, 2 is neutral and 3 is positive

47.

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

a)

into thee page

b)

out of the page

c)

downward

d)

upward

e)

the magnetic force is zero since the velocity is parallel to the current

48.

two very long parallel wires are a distance d apart and carry equal currents in opposite 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 of 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 left wire and also a distance d to the right of the right wire

d)

a distance d/sqrt(2) to the left wire and also a distance d/sqrt(2) tot eh right of the wire

e)

the net field is not zero anywhere

49.

the figure shows 3 long, parallel current-carrying wires. the magnitudes of the currents are equal and there directions are indicated in the figure. which of the arrows drawn near the wire carrying current 1 correctly indicates the direction of the magnetic fore acting on that wire

a)

A

b)

B

c)

C

d)

D

e)

the magnetic force on current 1 is equal to zero

50.

a long straight conductor has constant current flowing to the right. a wire rectangle is situated above thr wire and also has a constant current flowing through it. which of the statements is true. the net magnetic force on the wore rectangle is...

a)

upward, and there is also a net torque on it

b)

zero and the net torque is zero

c)

downward and there is also a net torque on it

d)

zero but there is a net torque on it

e)

downward and the net torque on it is zero

51.

a ring with clockwise current (as seen from above the ring) is situated with its center directly above another ring, which has a counterclockwise 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

52.

a very long solid, conducting cylinder of radius R carries a current along its length uniformly distributed throughout the cylinder. which one of the graphs shown in the figure most accurately describes the magnitude B of the magnetic field produced by this current as a function of the distance r from the central axis

a)
b)
c)
d)
e)
53.

a circular loop of wire lies in the plane of the paper. an increasing magnetic field points out of the paper. what is the direction of the induced current in the loop

a)

a counterclockwise then clockwise

b)

clockwise then counterclockwise

c)

clockwise

d)

counterclockwise

e)

there is no current induced in the loop

54.

a coil lies flat on a tabletop in a region where the magnetic field vector points straight up. the magnetic field vanishes suddenly. when viewed from above what is the direction of the induced current in this coil as the field fades

a)

counter-clockwise then clockwise

b)

Clockwise then counterclockwise

c)

clockwise

d)

Counterclockwise

e)

there is no current induced in the coil

55.

the long straight wire in the figure carries a current I that is decreasing with time at a constant rate. the circular loops A, B, and C all lie in a plane containing the wire. the induced emf in each to the loops A B and C is such that...

a)

no emf is induced in any of the loops

b)

a counterclockwise emf is induced in all the loops

c)

loop A has a clockwise emf, loop B has no induced emf and loop C has a counterclockwise emf

d)

loop A has a counterclockwise emf, loop B has no induced emf and loop C has a clockwise emf

e)

loop A has a counterclockwise emf loops B and C have clockwise emfs

56.

a large magnetic flux change through a coil must induce a greater emf in the coil then a small flux change

a)

true

b)

false

57.

the figure shows a bar magnet moving vertically upwards toward a horizontal coil. the poles of the bar magnets are labeled X and Y. as the bar magnet approaches the coil it induced an electric current in the direction indicated in the figure. (counterclockwise as viewed from above) what are the correct polarities of the magnet

a)

X is a South Pole Y is a North Pole

b)

X is a north pole Y is a South Pole

c)

both x and y are north poles

d)

both x and y are south poles

e)

the polarities of the magnet cannot be determined from the information given

58.

a circular metal ring is situated above a long straight wire as shown in the figure. the straight wire has a current flowing to the right, and the current is increasing in time at a constant rate. which statement is true

a)

there is an induced current in the metal ring flowing in a clockwise direction

b)

there is an induced current in the metal ring flowing in a counter-clockwise direction

c)

there is no induced current in the metal ring because the current in the wire is changing at a constant rate

59.

in the figure a straight wire carries a steady current I perpendicular to the plane of the page. a bar is in contact with a pair of circular rails and rotates about the straight wire. the direction of the induced current through resistor R is...

a)

from a to be

b)

from b to a

c)

there is no induced current through the resistor

60.

in the figure the inner loop carries a clockwise current I that is increasing. the resistor R is in the outer loop and both loops are in the same plane. the induced current through the resistor R is...

a)

from a to b

b)

from b to a

c)

there is no induced current through the resistor

61.

in the figure a bar magnet moves away from the solenoid. the induced current through the resistor R is...

a)

from a to b

b)

from b to a

c)

there is no induced current through the resistor

62.

a resistor and an ideal inductor are connected in series to an ideal battery having a constant terminal voltage Vo. at the moment contact is made with the battery the voltage across the resistor is

a)

Vo

b)

Vo/e

c)

Vo/2

d)

0

63.

a resistor and an ideal inductor are connected in series to an ideal battery having a constant terminal voltage Vo. at the moment contact is made with the battery the voltage across the inductor is

a)

Vo

b)

Vo/e

c)

Vo/2

d)

0

64.

which of the following statements about inductors are correct

a)

when it is connected in a circuit, an inductor always resists having a current flow through it.

b)

inductors store energy by building up charge

c)

when an inductor and a resistor are connected in series with the DC battery, the current in the circuit is reduced to zero in one time constant

d)

an inductor always resists any change in the current through it

e)

when an inductor and a resistor are connected in series with a DC battery, the current in the circuit is 0 after a very long time

65.

in an electromagnetic wave the electric and magnetic fields are orientated such that they are...

a)

parallel to one another and perpendicular to the direction of wave propagation

b)

parallel to one another and parallel to the direction of wave propagation

c)

perpendicular to one another and perpendicular to the direction of wave propagation

d)

perpendicular to one another and parallel to the direction of wave propagation

66.

if the magnetic field of an electromagnetic wave is in the +x direction and the electric field of the wave is in the +y direction the wave is traveling in the ...

a)

xy plane

b)

+z direction

c)

-z direction

d)

-x direction

e)

-y direction

67.

if an electromagnetic wave as components Ey=E0sin⁡(kx−ωt)E_y=E_0\sin\left(kx-\omega t\right)  and Bz=B0sin⁡(kx−ωt)B_z=B_0\sin\left(kx-\omega t\right)  in what direction is it traveling

a)

-x

b)

+x

c)

+y

d)

-y

e)

+z

68.

when an electromagnetic wave falls on a white perfectly reflecting surface it exerts a force F on that surface. if the surface is now painted a perfectly absorbing black what will be the force that the same wave will exert on the surface

a)

4F

b)

2F

c)

F

d)

F/2

e)

F/4

69.

a ray of light goes from one transparent material to another as shown in the figure. what can you conclude about the indices of refraction of these two materials

a)

n1> or = n2

b)

n1>n2

c)

n1=n2

d)

n2> or =n1

e)

n2>n1

70.

when light goes from one material into another material having a higher index of refraction,,,

a)

its speed wavelength and frequency all decrease

b)

its speed and wavelength decrease but its frequency stays the same

c)

its speed decreases but its wavelength and frequency both increase

d)

its speed decreases bit its frequency and wavelength stay the same

e)

its speed increases its wavelength stays the same and its frequency stays the same

71.

a ray of light strikes a boundary between two transparent materials and there is no transmitted ray as shown in the figure. what can you conclude about the indices of refraction of these two materials

a)

n1> or = n2

b)

n1>n2

c)

n1=n2

d)

n2> or = nq

e)

n2>n1

72.

as you walk away from a vertical plane mirror your image in the mirror...

a)

is always the same height

b)

may or may not decrease in height depending on where the observer is positioned

c)

is always a real image no matter how far you are from the mirror

d)

changes from being a virtual image to a real image as you pass the focal point

e)

decreases in height

73.

suppose you place your face in front of a concave mirror. which one of the following statements is correct

a)

if you position yourself between the center of curvature and the focal point of the mirror you will not be able to see a sharp image of your face

b)

no matter where you place yourself a real image will be formed

c)

your image will always be inverted

d)

your image will be diminished in size

e)

none of these statements are true

74.

a convex lens has a focal length f. if an object is located extremely far from the lens (at infinity) the image formed is located what distance from the lens

a)

infinity

b)

2f

c)

between f and 2f

d)

f

e)

between the lens and f

75.

an object is placed in front of a lens which forms an image of the object

a)

if the lense is convex, the image cannot be virtual

b)

if the image is real the image is also inverted

c)

if the image is real then it is also upright

d)

if the image is virtual then it is also inverted

e)

if the image is virtual the lens must be a diverging lens

76.

a beam of light which is traveling in air is reflected by a glass surface. does the reflected beam experience a phase changed if so how much is the phase of the beam changed

a)

the reflected beam does not experience a phase change

b)

the reflected beam experiences a 180º phase change

c)

the reflected beam experiences a 40º phase change

d)

the reflected beam experiences a 90º phase change

77.

a soap film is viewed in white light. if the film is much thinner than the wavelength of blue light, what is the appearance of the film

a)

the soap film appears red because all the other colors are transmitted

b)

the soap film appears totally transparent because it reflects no visible light

c)

the soap appears blue becasue all othes colors are transmited

d)

the soap film appears white because it reflects all wavelengths of visible light

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