Electrostatics is the branch of Physics that deals with charges at rest. Electrostatic phenomena ascend from the forces that electric charges exert on each other. Electrostatics involves the accumulation of charge on the surface of objects due to contact with other surfaces. Given below are the top 10 MCQs on Electrostatics.

## Electrostatics deals with charges

Electrostatics deals with charges:

- At motion
- At rest
- Both of above
- None of these

Correct answer: 2. At rest

Explanation: Electrostatics is the branch of engineering that deals with charges at rest.

## SI unit of charge is

SI unit of charge is:

- Henry
- Farad
- Coulomb
- Tesla

Correct answer: 3. Coulomb

Explanation: SI unit of charge is the coulomb. It is abbreviated as C. One coulomb of charge is equal to charge on 625 * 10^16 electrons.

1 Coulomb = 625 * 10^16 electrons

## The force between two electrons separated by distance r varies as

The force between two electrons separated by distance r varies as:

- r
- r^2
- 1/r
- 1/r^2

Correct answer: 4. 1/r^2

## Electric lines of force enter or leave the charged surface at an angle of

Electric lines of force enter or leave the charged surface at an angle of:

- 30°
- 60°
- 90°
- None of these

Correct answer: 3. 90°

## The relative permittivity of air is

The relative permittivity of air is:

- 0
- 0.3
- 1
- 1.954

Correct answer: 3. 1

Explanation: The relative permittivity is defined as the permittivity of a material expressed as a ratio to the electric permittivity of a vacuum.

## The work done during process when a charge is brought from infinity along perpendicular bisector of dipole is

The work done during process when a charge is brought from infinity along perpendicular bisector of dipole is:

- Positive
- Zero
- Negative
- None of these

Correct answer: 2. Zero

## Electrical potential is

Electrical potential is:

- Scalar quantity
- Vector quantity
- Any of these
- None of these

Correct answer: 1. Scalar quantity

## The dielectric employed in high voltage transformers is

The dielectric employed in high voltage transformers is:

- Mica
- Oiled paper
- Paraffin
- Porcelain

Correct answer: 4. Porcelain

## The possible value of relative permittivity of dielectric can be

The possible value of relative permittivity of dielectric can be:

- -3
- 1
- 1/3
- 5

Correct answer: 4. 5

Explanation: The relative permittivity of all dielectrics is greater than 1

## While bringing an electron towards another electron, the electrostatic potential energy

While bringing an electron towards another electron, the electrostatic potential energy:

- Increases
- Decreases
- Remains the same
- None of these

Correct answer: 1. Increases

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