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Physics Electrostatics Online Mcqs Test

Mustansar KhanLast Updated: October 13, 2025

Important Physics Electrostatics Question and Answer

Total Questions:	67
Time Allowed:	30 Minutes
Total Marks:	67
How to Attempt Test:	Please choose the right Option in MCQ-type question.
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Physics Electrostatics Practice Test Online With Explanation

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Physics

1. A cube of metal is given a positive charge Q. For the above system, which of the following statements is true?

Electric potential at the surface of the cube is zero

Electric filed is normal to the surface of the cube

Electric field varies within the cube

Electric potential within the cube is zero

2. The ratio of the capacitance of a parallel plate capacitor with an insulating substance as medium between the plates to its capacitance with vacuum (or air) as medium between them is the definition of

Capacitance

Relative permittivity

Dielectric constant

Dielectric

3. An alpha particle is accelerated through a potential difference of 10⁶ volt. Its kinetic energy will be

2 MeV

1 MeV

8 MeV

4 MeV

4. Two conductor having the same type of charges are connected by a conducting wire. There would not be any amount of charges on them if

They have the same amount of charge

They have the same potential

They have the same capacity

They have the same shape

5. In a charged capacitor the energy resides in

Nuclear field

Gravitational field

Magnetic field

Electric field

6. Force on a charged particle due to an electrostatic field is called:

Magnetic force

Nuclear force

Force of gravity

Electrostatic force

7. An electric dipole is at the center of a hollow sphere of radius r. The total normal electric flux through the sphere is (here Q is the charge and d is the distance between the two charges of the dipole)

Zero

2Q/4πr²

Q/4πr²

Q.d

8. Flux coming out from a unit positive charge placed in air is

4πε₀

ε₀¯¹

ε₀

4(πε₀)¯¹

9. Relative permittivity of air at one atm is __________ as compared to vacuum.

Greater

Lesser

Zero

Equal

10. Xerography means

None of these

Dry writing

Wet writing

Type writing

11. The force between two charges in 8N. Now placed a mica of relativity 4 between two charges as a medium, the force then reduced to

4 N

2 N

6 N

8 N

12. The electric flux through the surface of a sphere of radius “r” due to a point charge q placed at its center depends upon:

The surface area of the sphere

The quantity of charge inside of the sphere

The radius of the sphere

The quantity of charge outside of the sphere

13. The map of electric field lines provides the information of electric fields’

Position

Both A and B

Strength

Direction

14. At a point, the electric field intensity has

One value

Infinite values

No value

Two values

15. A point charge Q is placed at the mid-point of a line joining two charges, 4q and q. If the net force on charge q is zero, then Q must be equal to

+4q

-2q

-q

16. The Earth’s potential is considered to be at

Maximum

Infinite

Zero

Minimum

17. The electric field is uniform

Between two parallel oppositely charged plates.

Near a negative point charge

Near a positive point charge

Near a charged plate

18. A hollow insulated conduction sphere is given a positive charge of 10μC. What will be the electric field at the center of the sphere if its radius is 2 meters?

8μC m¯²

5μC m¯²

20μC m¯²

Zero

19. Electric potential is a

Scalar Quantity

None

Vector quantity

Null vector

20. Why the toner is given a negative charge to the drum of printer?

To spread over the drum

None of these

To neutralize writing

To stick the writing

21. The volt is equal to

N/m²

Joule/coulomb

C/q

Nm²/C

22. An electric force which folds the charges to make atoms and molecules

Positive charges

Negative charges

Neutral charges

A and B

23. Potential difference is the work done is moving unit positive charge form one point to another

In any direction

In the direction of electric flux

Against electric intensity

In the direction of electric intensity

24. The charges are attracted when

Two charges are alike

A and B

Two charges are opposite

None of these

25. Selenium is an insulating material when exposed to

None of these

Dark

Monochromatic light

Light

Page 2 of 3

26. Capacitor is a device used for:

Storing current

Storing electric charge

Storing voltage

Producing charges

27. Electric force between two point charges in air or vacuum is F. If we replace air or vacuum by an insulator (dielectric) of relative permittivity Cr the force between the charges will

Depends upon composition of dielectric

Increase

Decreases

Remain constant

28. The unit of intensity of electric field is

Joule/coulomb

Newton/coulomb

Newton/meter

Volt x meter

29. If the distance of separation between two chares is increased, the electrical potential energy of the system will

Decrease

Increase

Remain the same

May increase or decrease

30. Equal charges are given to two spheres of different radii. The potential will

Depend on the nature of the material of the sphere

Be more on the smaller sphere

Be equal on both the sphere

Be more on the bigger sphere

31. Two similar charges of equal magnitude of one coulomb are placed in vacuum at what distance they will exert force of 9 x 10⁹ N?

100 meters

0 meters

1 meters

10 meters

32. A point charge in space is attracted towards a dielectric material because of the

Phenomenon of dielectric polarization

All of above

Maximization of electrostatic flux

Dielectric hysteresis

33. A capacitor is a perfect insulator for

Both for the direct and alternating current

Direct current

None of these

Alternating current

34. The electric field created by a positive charge is directed

Radially outward

Tangentially outward

Tangentially inward

Radially inward

35. If mica sheet is placed between the plates of a capacitor the capacity

Decreases then increases

Increases then decreases

Increases

Decreases

36. Capacitor is to have an energy content of 20J it must be placed across a potential difference of

2 volts

1 vol

4 volts

9 volts

37. The test charge is always a unit

A and B

None of these

Positive charge

Negative charge

38. The Sl. Unit of an electric flux is

Nm²C¯¹

NmC¯¹

NmC¯²

Nm²C¯²

39. Equivalent capacitance is greater than individual capacitances is

None of these

Both series and parallel combinations

Parallel combination

Series combination

40. Which of the following is the property of electrostatic field lines?

Electrostatic field lines always start on positive charge and end on negative charges

All Choices are

The direction of the field at a point is along the tangent to the line of force

The number of lines that originate form, or terminate on a charge is proportional to the magnitude of the charge

41. If the distance between the two point charges become half then force between them becomes

Remains same

Half

Four times

Double

42. Unit of electric flux density is

Coulomb.

Farad/meter.

Weber / meter².

Coulomb/meter².

43. In the region of any positive point charge the other positive point charge feels

Opposite force

Both A and B

Attractive force

Repulsive force

44. An electron of charge e coulomb passes through a potential difference of V volts. Its energy in ‘joules’ will be

e/V

V/e

45. An electric field lines provides the information about

Electric force

Direction

Medium

All of them

46. In an inkjet printer, the toner drops are

Charged

Not charged

None of these

Charged and deflected

47. The value of the capacitance depends upon the

Density of the capacitor plates

Thickness of the capacitor plates

Voltage applied

Geometry of the capacitor

48. In a non-uniform electric field a polar molecule will experience

Both series and parallel combinations

Zero

Net force

Net torque

49. If a closed surface contains two equal and opposite charges, the net electric flux from the surface is

None of these

Zero

Positive

Negative

50. Gaussian surface may be

Rectangular

None of these

Spherical

Any shape

Page 3 of 3

51. Electric flux linked with a surface will be maximum when

The surface is held perpendicular to the electric field

The surface makes an angle of 45? With the field

The surface is held parallel to the electric field

All of the above

52. Two charges are placed at a certain distance. If the magnitude of each charge is doubled the force will become

1/8th of its original value

8 times of its original value

1/4th of its original value

4 times of its original value

53. Is the Gravitational force is conservation?

None of these

Yes

A little

54. If an Area “A” is held perpendicular to the field lines of an electric field of intensity E, the flux through the area is

Zero

One

E/A

55. The constant K in Coulomb’s Law depend upon

System of units

A & B

Intensity of charge

Nature of medium

56. In a charged capacitor the energy is stored in the form of

Electric Field

Gravitational Field

Nuclear Field

Magnetic field

57. The electric field lines exerting force on a charge are also known as

Force lines

Lines of force

Both A and B

Force of lines

58. Electric charge of 100? C is 13cm apart from another charge 16.9? C electric force between them is

900 N

9 x 10⁷ N

9 x 10⁵ N

9 x 10⁶ N

59. Electric field inside a hollow metallic charged sphere i

Zero

None of these

Decreasing towards center

Increasing towards center

60. A test charge q is the charge which is

All of these

Very long

Very small

A point charge

61. Polarization of dielectric between the plates of a parallel plate capacitor ___________ the capacity of the capacitor.

Neutralizes

Nullify

Decreases

Increases

62. Consider a spherical shell of metal at the center of which a positive point charge is kept

The electric field is non-zero in both regions outside and inside the shell

The electric field is zero everywhere

The electric field is zero in the region inside the shell

The electric field is zero outside the shell

63. The direction of Electric intensity E is along the

None of these

May be decreasing or increasing

Increasing potential

Decreasing Potential

64. The number of electrons in one coulomb charge is equal to

6.2 x 10¹⁸

1.6 x 10¹⁹

1.6 x 10¯²⁷

6.2 x 10²¹

65. Coulomb’s law for the force between electric charges most closely resembles with

Law of conservation of energy.

Gauss’s theorem.

Newton’s law of motion.

Newton’s law of gravitation.

66. The relative permittivity for air at 1 atmospheric pressure is

1.0004

1.0006

1.0002

1.0008

67. Two similar charges each of the coulomb placed in air one meter apart repel each other with a force

9.2 x 10⁴N

9.3 x 10⁹N

9 x 10⁹N

9 x 10⁷N

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Mustansar KhanLast Updated: October 13, 2025

Physics Electrostatics Online Mcqs Test

Important Physics Electrostatics Question and Answer

Physics Electrostatics Practice Test Online With Explanation

Physics

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