Free Printable Electrostatics Revision

1.

Two electrically charged identical-sized metal spheres, A (charge of -4) and B (charge of +8). If the spheres are brought into contact, which sphere will have a net gain of electrons?

a)

both A and B

b)

neither

c)

only A

d)

only B

2.

A positively charged rod is held near the knob of a neutral electroscope. What best describes what will happen to the leaves?

a)

the leaves will spread apart and be positive

b)

the leaves will spread apart and be negative

c)

the leaves will stay closed and be positive

d)

the leaves will stay closed and be negative

3.

Two electrically neutral metal spheres, A and B, on insulating stands are placed in contact with each other. A negatively charged rod is brought near, but does not touch the spheres, as shown in the diagram below. How are the spheres now charged?

a)

A is positive and B is positive.

b)

A is negative and B is positive.

c)

A is positive and B is negative.

d)

A is negative and B is negative.

4.

Which net charge could be found on an object?

a)

4.8 x 10^-19 C

b)

1.8 x 10^-19 C

c)

3.0 x 10^-19 C

d)

2.8 x 10^-19 C

5.

Three charged metal spheres, X, Y, and Z, are on insulating stands. All three spheres are simultaneously brought into contact with each other and then returned to their original positions.
Which statement best describes the charge of the spheres after this procedure is completed?

a)

All the spheres will end up with the same charge

b)

All the spheres are neutral

c)

Sphere Y has a greater charge than spheres X or Z

d)

Each sphere retains the same charge that it had originally

6.

Electrostatic force F exists between two point charges. If the both charges are doubled, the force between the charges will be

a)

F

b)

4F

c)

2F

d)

F/4

7.

Which of the following is a false statement about electrostatic force.

a)

Bringing charges closer together strengthen the force.

b)

The electrostatic constant remains the same.

c)

The values of the two charges is always the same.

d)

Electrostatic force can be attractive or repulsive

8.

An electrostatic force of magnitude F exists between two metal spheres having identical charge q. The distance between their centers is r. Which combination of changes would produce no change in the electrostatic force between the spheres?

a)

doubling q on both spheres while halving r

b)

doubling q on one sphere while halving r

c)

doubling q on one sphere while doubling r

d)

doubling q on both spheres while doubling r

9.

Two similar metal spheres, A and B, have charges of +2.0 x 10^-6 coulomb and +1.0 x 10^-6 coulomb, respectively. The magnitude of the electrostatic force on A due to B is 4.0N newtons. What is the magnitude of the electrostatic force on B due to A?

a)

2.0N

b)

4.0N

c)

8.0N

d)

1.0N

10.

Metal sphere A has a charge of -2 units and an identical metal sphere, B, has a charge of -4 units. If the spheres are brought into contact with each other and then separated, B will _____

a)

gain 1 electron

b)

lose 1 electron

c)

gain 3 electrons

d)

lose 3 electrons

11.

What does it mean when the electric field lines are close together?

a)

the field is positive

b)

the field is negative

c)

The field is strong

d)

the field is weak

12.

Charged objects are not attracted to neutral objects

a)

True

b)

False

13.

Where do electrons go when you rub a balloon on your hair?

a)

Onto the balloon

b)

Into your hair

c)

Nowhere

14.

When two objects are rubbed together, there is a transfer of electrons. How do you determine which object acquires the transferred electrons?

a)

Always transfer from the bigger to the smaller object, to make it even

b)

Transfer is based on the initial charge of the two objects

c)

Transfer is based on how much electron affinity that each object has

d)

Always transfer from the more negative to the more positive object

15.

What method of static charging is shown in this picture

a)

Contact

b)

Friction

c)

Grounding

d)

Electron Shifting

16.

When a charged object contacts another object (one is usually a conductor), there is a transfer of electrons. How do you determine which object acquires the transferred electrons?

a)

Always transfer from the bigger to the smaller object, to make it even

b)

Transfer is based on the initial charge of the two objects

c)

Transfer is based on how much electron affinity that each object has

d)

Always transfer from the more negative to the more positive object

17.

What is the end result of charging by friction?

a)

Both object have the same charge, so they will attract one another

b)

Both object have the same charge, so they will repel one another

c)

Both object have the opposite charge, so they will attract one another

d)

Both object have the opposite charge, so they will repel one another

18.

After grounding, how will objects interact?

a)

Both will have the same charge, so they attract one another

b)

Both will be neutral, so they will attract one another

c)

Botn will be neutral, so they will repel one another

d)

Both will be neutral, so they will not attract nor repel

19.

Insulators are best for demonstrating electrostatics because they

a)

are easier to melt

b)

don't easily lose a charge when touched

c)

are readily available

d)

are made of gold

20.

Arrows on electric field lines pointing inward represent a charge of

a)

neutral

b)

negative

c)

positive

d)

zero

21.

What direction are the electric field lines around an electron?

a)

towards the charge

b)

away from the charge

22.

What happens to the force between two charged objects if you double the distance between them and double the magnitude of one charge?

a)

4X

b)

6X

c)

1/2X

d)

1/6X

23.

When distance increases, electrostatic force ____________; we call this relationship ____________ proportional

a)

decreases;directly

b)

decreases;inversely

c)

increases;inversely

d)

increases;directly

24.

Why might someone wear anti-static clothing if they work with a lot of computers?

a)

So that they don't stick to their chair

b)

To make sure they don't get a shock when they touch metal

c)

To avoid building up charges that could damage hard drives

d)

To prevent static discharge from causing fires

25.

What is the triboelectric series?

a)

Like the World Series: objects compete for electrons

b)

A series of events that create a static charge

c)

A list of materials arranged by strength of electron-holding

d)

A number to show how well an object conducts electrons

26.

Sphere A carries a charge of +8 coulombs, and Sphere B carries a charge of -6 coulombs. If the two are touched together and then separated, what will the charge on sphere A be?

a)

+1

b)

-1

c)

+2

d)

-2

27.

Which method of charging an object leaves both objects with the same charge?

a)

Friction

b)

Conduction

c)

Induction

d)

Electroscope

28.

If a positively charged rod is brought near a neutral pith ball, what will the pith ball do?

a)

Move away from the rod

b)

Move toward the rod

c)

Do nothing

d)

Disappear

29.

The electric potential at a distance of 4 m from a certain point charge is 200 V relative to infinity. What is the potential (relative to infinity) at a distance of 2 m from the same charge?

a)

600 V

b)

50 V

c)

200 V

d)

400 V

30.

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

a)

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.

b)

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

c)

The potential at all three locations is the same.

d)

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

31.

Two protons are released from rest, with only the electrostatic force acting. Which of the following statements is NOT true about them as they move apart?

a)

Their electric potential energy keeps decreasing.

b)

Their electric potential energy keeps increasing.

c)

Their acceleration keeps decreasing.

d)

Their kinetic energy keeps increasing.

32.

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

a)

1.60 × 10^-17 J

b)

-1.6 J

c)

1.6 J

d)

-1.60 × 10^-17 J

33.

What is the electrostatic potential at equatorial point of a dipole?

a)

twice of the axial point

b)

half of the axial point

c)

zero

d)

not defined

34.

Why must electrostatic field at the surface of a charged conductor be normal to the surface at every point?

a)

As electric field inside conductor is always zero

b)

If not normal than it will have component parallel to the surface and perpendicular to the surface

c)

parallel component of the field will generate current along the surface, which is not possible

d)

work done in moving the charge along the surface ha to be zero

35.

Two charges – q and + q are located at points A (0, 0, -a) and B (0, 0, +a) respectively. How much work is done in moving a test charge 2 µC from point P (7, 0, 0) to Q (-3, 0, 0)?

a)

$\frac{Kq^2}{100}$

b)

$\frac{Kq^2}{16}$

c)

$\frac{Kq^2}{10}$

d)

zero

36.

Relation between the electric field and the electrostatic force due to a source charge Q at a point 'r' distance away from the charge on test charge q₀ is

a)

F=Eq₀

b)

F=E/Q

c)

F=E/q₀

d)

F=EQ

37.

A tiny sphere carrying a charge of 6.5 µC sits in an electric field, at a point where the electric potential is 240 V. What is the sphere’s potential energy?

a)

2.7 x 10^-8 J

b)

6.5 x 10^-6 J

c)

1.6 x 10^-3 J

d)

240 J

38.

If 500 J of work are required to carry a 40-C charge from one point to another, the potential difference between these two points is:

a)

12.5 V

b)

20,000 V

c)

0.08 V

d)

depends on the path

39.

Charge Q is distributed uniformly throughout a spherical insulating shell. The net electric flux through the inner surface of the shell is:

a)

0

b)

Q/e₀

c)

2Q/e₀

d)

Q/4*Pi*e₀

40.

The flux of the electric field (24 N/C)i + (30 N/C)j + (16 N/C)k through a 2.0 m² portion of the xz plane is:

a)

32 N × m²/C

b)

34 N × m²/C

c)

42 N × m²/C

d)

60 N × m²/C

41.

The electric potential in a region of space is given by the function V=3x²+ 2y³. what is the x-component of the electric field in this area?

a)

6x

b)

-6x

c)

x³

d)

-x³

42.

1 Coulomb is equivalent to

a)

6 x 10^17 Charges

b)

6 x 10^18 Charges

c)

6 x 10^19 Charges

d)

6 x 10^20 Charges

43.

The net force on an electric dipole in an uniform electric field is

a)

0

b)

>0

c)

<0

d)

varies from negative to positive value from negative to positive charge.

44.

The expression for Torque on an electric dipole in an uniform electric field is __________

a)

$\overrightarrow{\ \tau\ }=\overrightarrow{E}\ \times\overrightarrow{p}\$

b)

$\overrightarrow{\ \tau\ }=\frac{\overrightarrow{p}}{\overrightarrow{E}}\$

c)

\overrightarrow{\ \tau\ }=\overrightarrow{p}\ \times\overrightarrow{E}

d)

$\overrightarrow{\tau}=\overrightarrow{p}.\overrightarrow{E}$

45.

Electric field of a thin spherical shell of charge density σ and radius R at a point r>R, r=R and r<R respectively are

a)

\frac{\sigma}{\epsilon_0}\frac{R^2}{r^2},\ 0\ ,\frac{\sigma}{\epsilon_0}\

b)

$\ \frac{\sigma}{\epsilon_0},\ 0,\ \frac{\sigma}{\epsilon_0}\frac{R^2}{r^2}$

c)

$\frac{\sigma}{\epsilon_0},\ \frac{\sigma}{\epsilon_0}\frac{R^2}{r^2},\ 0$

d)

$\frac{\sigma}{\epsilon_0},\ 0,\ \frac{\sigma}{2\epsilon_0}$

46.

Dimensional formula of the permittivity of free space $\epsilon_0$ is

a)

$[M^1L^3T^{-4}A^{-2}]$

b)

$[M^{-1}L^{-3}T^2A^2]$

c)

$[M^{-1}L^{-3}T^4A^2]$

d)

$[M^{-1}L^{-2}T^4A^2]$

47.

The electric field inside a charged conducting sphere of radius R is

a)

$\frac{1}{4\pi\epsilon_0}\ \frac{q}{R^2}$

b)

$\frac{1}{4\pi\epsilon_0}\ \frac{q}{r^2}$

c)

$\frac{1}{4\pi\epsilon_0}\ \frac{q}{R}$

d)

0

48.

The force of attraction between two charges is given by

a)

$\frac{1}{4\pi\epsilon_0}\ \frac{q_1q_2}{r^2}$

b)

$\frac{1}{4\pi\epsilon_0}\ \frac{q_{ }}{r^2}$

c)

$\frac{1}{4\pi\epsilon_0}\ \frac{q_1q_2}{r^{ }}$

d)

$\frac{1}{4\pi\epsilon_0}\ \frac{q_1q_2}{r^3}\ \overrightarrow{\ r}\$

49.

The potential inside a uniformly charged spherical shell of radius R and surface charge density $\sigma$ is

a)

$\frac{R^2\sigma}{\epsilon_0z}$

b)

$\frac{R\sigma}{\epsilon_0}$

c)

$0$

d)

$\frac{1}{4\pi\epsilon_0}\ \frac{\sigma}{R}$

50.

Electric field due to an infinite plane sheet having surface charge density $\sigma$ is

a)

$\frac{\sigma}{\epsilon_0}$

b)

$\frac{2\sigma}{\epsilon_0}$

c)

$\frac{\sigma}{\epsilon_0z}$

d)

$\frac{\sigma}{2\epsilon_0}$

51.

Which charge configuration Produces a uniform electric field?

a)

Point charge

b)

Uniformly charged infinite line

c)

Uniformly charged infinite plane

d)

Uniformly charged spherical shell

52.

Which charge configuration Produces a uniform electric field?

a)

Point charge

b)

Uniformly charged infinite line

c)

Uniformly charged infinite plane

d)

Uniformly charged spherical shell

53.

a)

D<C<B<A

b)

D>C>B>A

c)

A<B=C<D

d)

C<A=B<D

54.

a)

A

b)

B

c)

C

d)

D

55.

An electric field E= 10xi exist in certain region of space. Then the potential difference V = Vo-Va where Vo is the potential at orgin and Va is the potential at x= 2 m is

a)

10 V

b)

-10 V

c)

20 V

d)

-20 V

56.

Newton's Universal Law of Gravitation and Coulomb's Law share a very similar equation. What else do the Laws have in common (check all that apply)?

a)

Both forces can cause either attraction or repulsion

b)

Both forces are equal in strength

c)

Both forces are non-contact forces

d)

Both forces become weaker with distance

57.

Based on your knowledge of electric fields, what must be true about the picture shown above?

a)

Both A and B are negative

b)

A is negative and B is positive

c)

A is positive and B is negative

d)

Both A and B are positive

58.

Based on your knowledge of electric fields, what must be true about the picture shown above?

a)

Both X and Y are negative

b)

X is negative and Y is positive

c)

X is positive and Y is negative

d)

Both X and Y are positive

59.

Assuming the proton was held at 1.0 m away from the fixed charge and then moved 2.0 m away upon being released, we would say that the electric potential energy was:

a)

Positive because we would have to force it to move that way

b)

Negative because the charge is moving farther away

c)

Positive because both charges are positive

d)

Negative because the charges do the work of moving apart naturally

60.

According to Coulomb's law, you can do all of the following to increase the electric force of repulsion EXCEPT

a)

Increase charge 1

b)

Increase charge 2

c)

Decrease the distance

d)

Increase the distance

61.

What are the units of electric potential?

a)

volts (V) or joules/coulomb (J/C)

b)

joules (J)

c)

newtons (N)

d)

meters (m)

62.

Where is the electric field stronger?

a)

A

b)

B

63.

which is the field for opposite charges

a)

b)

c)

d)

64.

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

a)

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.

b)

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

c)

The potential at all three locations is the same.

d)

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

65.

Which of the following quantities are vectors ?

a)

Electrostatics Force

b)

Electric field

c)

Electric Potential

d)

Electric Potential Energy

e)

Equipotential Surface

66.

The work done by a test charge to move from a point to other point on the same equipotential surface is ....

a)

zero

b)

1 Joule

c)

infinity

67.

What variables affect the magnitude of the electric force between two objects with charge?

a)

charge of the first object

b)

charge of the second object

c)

distance between the charges

d)

all of the answers

68.

What do you call the process of charging a conductor by bringing it near another charged object and grounding it?

a)

induction

b)

polarization

c)

neutralization

d)

conduction

69.

What is the overall charge of an object that has been charged by polarization?

a)

Positive

b)

Negative

c)

Neutral

70.

If a conductor is in electrostatic equilibrium, the electric field inside the conductor is:

a)

Positive

b)

Negative

c)

Zero

d)

Perpendicular

71.

The capacity of a parallel plate capacitor is 10 μF when the distance between its plates is 8 cm. If the distance between the plates is reduced to 4 cm , the capacity will be

a)

10 μF

b)

5 μF

c)

20 μF

d)

40μF

72.

A hollow spherical conductor carries negative charge. A positive charge is placed at the center of the sphere. Then this positive charge will

a)

Oscillate between the opposite points of the conductor

b)

Stick to the conductor

c)

move in the circle

d)

Stay at the center

73.

When the three capacitors of 3 ,4 , 5 units are connected in series , the equivalent capacity is

a)

12

b)

60

c)

1.28

d)

0.78

74.

Eight drops of the mercury of equal radii and possessing equal charge combine to form a big drop. The capacitance of the bigger drop as compared to the each similar drop is

a)

2 times

b)

8 times

c)

4 times

d)

16 times

75.

Small rain drops of the same size are charged to the potential V volts each. if such n drops coalesce to form a single drop, then the potential of the bigger drop will be

a)

n^1/3V

b)

n^2/3V

c)

nV

d)

n^3/2V

76.

The distance between the charges $5\times10^{-11}C$ and $–2.7\times10^{-11}C$ is 0.2 m. The distance at which the third charge should be placed in order that it will not experience any force along the line joining the two charges is

a)

0.44 m

b)

0.65 m

c)

0.566m

d)

0.350m

77.

A small sphere is charged due to a potential of 50 V and the big hollow sphere is charged to a potential of 100V. Electricity will flow from the smaller sphere to the bigger sphere one when

a)

The smaller one is placed inside the bigger one and connected by the wire

b)

The bigger one is placed inside the smaller one and connected by the wire

c)

The bigger one is placed near the smaller one and connected by the wire

d)

none of these

78.

A charged oil drop is to be held stationary between the two plates separated by a distance of 25 mm .If the mass of the drop is 5 × 10^-15 kg and the charge on it is 10^-18 C , the potential to be applied between the plates is ( g = 10m/s²)

a)

125 V

b)

1250 V

c)

2500 V

d)

450 V

79.

The mean electric energy density between the plates of the charged capacitor is ( 'q 'is the charge and 'A' is the area of the plates )

a)

$\frac{q^2}{2є_0A^2}$

b)

$\frac{q}{2є_0A^2}$

c)

$\frac{q^2}{2є_0A}$

d)

None

80.

A 0.2 μF capacitor is charged to 600 V. After removing it from the battery it is connected to another uncharged capacitor 1 μF in parallel. The voltage on the capacitor will become

a)

300 V

b)

600 V

c)

100 V

d)

120 V

81.

When the electric dipole $\overrightarrow{P}$ is placed in the electric field $\overrightarrow{E}$ then at what angle between the $\overrightarrow{P}$ & $\overrightarrow{E}$ , the torque will maximum

a)

90°

b)

0°

c)

180°

d)

45°

82.

Two conducting charged spheres having unequal charges are connected by the wire. What remains conserved?

a)

Total Energy of the spheres

b)

Charge

c)

Energy and the charge

d)

Neither Energy and the charge

83.

Two metallic spheres of the radii 1 cm and 2 cm are given charges 10^-2C and 5×10^-2C respectively. If they are connected by a conducting wire , the final charge on the smaller sphere will be

a)

1×10^-2C

b)

2×10^-2C

c)

3×10^-2C

d)

4×10^-2C

84.

Charge Q is divided in to two parts which are then kept some distance apart . The force between them will be maximum if the two parts are

a)

$\frac{Q}{2}\ each$

b)

$\frac{Q}{4}\ and\ \frac{3Q}{4}$

c)

$\frac{Q}{3}\ and\ \frac{2Q}{3}$

d)

$e\ and\ \left(Q-e\right)$

85.

In the region of the space , The electric field is in the x –direction and proportional to x , $\overrightarrow{E}$ = $E_0$ x î . Consider an imaginary cubical volume of the edge a with the edges parallel to the axes of the coordinates . The charge inside this volume is

a)

Zero

b)

$\epsilon_0E_0a^3$

c)

$\frac{E_0a^3}{\epsilon_0}$

d)

$\frac{\epsilon_0E_0a^3}{6}$

Electrostatics Revision

Total questions: 85

Worksheet time: 1hrs 25mins

Similar Resources on Wayground