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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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Page 1 of 3

Physics

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

4 MeV

8 MeV

2 MeV

1 MeV

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

9.2 x 10⁴N

9 x 10⁷N

9 x 10⁹N

9.3 x 10⁹N

3. A capacitor is a perfect insulator for

None of these

Alternating current

Both for the direct and alternating current

Direct current

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

The electric field is zero outside the shell

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

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

Neutral charges

A and B

Negative charges

Positive charges

6. The charges are attracted when

None of these

Two charges are alike

A and B

Two charges are opposite

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

Electric field varies within the cube

Electric potential at the surface of the cube is zero

Electric potential within the cube is zero

Electric filed is normal to the surface of the cube

8. 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

20μC m¯²

Zero

5μC m¯²

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

Double

Half

Four times

Remains same

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

Be more on the bigger sphere

Depend on the nature of the material of the sphere

Be equal on both the sphere

Be more on the smaller sphere

11. 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

Relative permittivity

Dielectric constant

Capacitance

Dielectric

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

In the direction of electric flux

In the direction of electric intensity

In any direction

Against electric intensity

13. 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

14. 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

2 N

8 N

6 N

4 N

15. Electric potential is a

None

Scalar Quantity

Null vector

Vector quantity

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

Repulsive force

Both A and B

Opposite force

Attractive force

17. 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

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

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

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

19. The test charge is always a unit

Positive charge

None of these

A and B

Negative charge

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

Force of gravity

Magnetic force

Nuclear force

Electrostatic force

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

4πε₀

ε₀

ε₀¯¹

4(πε₀)¯¹

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

To spread over the drum

To neutralize writing

None of these

To stick the writing

23. The Sl. Unit of an electric flux is

NmC¯²

NmC¯¹

Nm²C¯¹

Nm²C¯²

24. An electric field lines provides the information about

Direction

Electric force

All of them

Medium

25. The electric field is uniform

Near a charged plate

Near a positive point charge

Near a negative point charge

Between two parallel oppositely charged plates.

Page 2 of 3

26. The volt is equal to

C/q

N/m²

Nm²/C

Joule/coulomb

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

1 vol

2 volts

4 volts

9 volts

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

The surface is held parallel to the electric field

The surface makes an angle of 45? With the field

The surface is held perpendicular to the electric field

All of the above

29. Electric field inside a hollow metallic charged sphere i

Increasing towards center

None of these

Zero

Decreasing towards center

30. 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

31. The direction of Electric intensity E is along the

Increasing potential

May be decreasing or increasing

Decreasing Potential

None of these

32. Unit of electric flux density is

Farad/meter.

Coulomb.

Weber / meter².

Coulomb/meter².

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

Lines of force

Both A and B

Force lines

Force of lines

34. Equivalent capacitance is greater than individual capacitances is

None of these

Both series and parallel combinations

Series combination

Parallel combination

35. Capacitor is a device used for:

Storing voltage

Storing electric charge

Producing charges

Storing current

36. The value of the capacitance depends upon the

Geometry of the capacitor

Density of the capacitor plates

Voltage applied

Thickness of the capacitor plates

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

One

E/A

Zero

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

System of units

Nature of medium

Intensity of charge

A & B

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

9 x 10⁷ N

9 x 10⁵ N

900 N

9 x 10⁶ N

40. 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

Increase

Remain constant

Depends upon composition of dielectric

Decreases

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

Increases

Neutralizes

Nullify

Decreases

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

Position

Strength

Both A and B

Direction

43. 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 shape

They have the same potential

They have the same capacity

They have the same amount of charge

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

Both series and parallel combinations

Net torque

Zero

Net force

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

May increase or decrease

Remain the same

Increase

Decrease

46. At a point, the electric field intensity has

Two values

One value

No value

Infinite values

47. In a charged capacitor the energy resides in

Magnetic field

Electric field

Nuclear field

Gravitational field

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

6.2 x 10²¹

1.6 x 10¹⁹

6.2 x 10¹⁸

1.6 x 10¯²⁷

49. A test charge q is the charge which is

Very long

All of these

Very small

A point charge

50. 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 radius of the sphere

The surface area of the sphere

The quantity of charge outside of the sphere

The quantity of charge inside of the sphere

Page 3 of 3

51. 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?

0 meters

10 meters

100 meters

1 meters

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

Magnetic field

Nuclear Field

Gravitational Field

Electric Field

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

Increases then decreases

Increases

Decreases

Decreases then increases

54. Is the Gravitational force is conservation?

Yes

None of these

A little

55. Gaussian surface may be

Any shape

Rectangular

Spherical

None of these

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

Radially inward

Tangentially inward

Tangentially outward

Radially outward

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

Law of conservation of energy.

Newton’s law of gravitation.

Gauss’s theorem.

Newton’s law of motion.

58. Xerography means

Type writing

Wet writing

Dry writing

None of these

59. Selenium is an insulating material when exposed to

Light

Dark

None of these

Monochromatic light

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

1.0004

1.0002

1.0006

1.0008

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

All of above

Dielectric hysteresis

Phenomenon of dielectric polarization

Maximization of electrostatic flux

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

Lesser

Greater

Zero

Equal

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

Zero

Minimum

Maximum

Infinite

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

e/V

V/e

65. In an inkjet printer, the toner drops are

Charged

None of these

Charged and deflected

Not charged

66. The unit of intensity of electric field is

Newton/coulomb

Volt x meter

Joule/coulomb

Newton/meter

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

None of these

Negative

Positive

Zero

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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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