Higher Study | Physics | Electric Potential

A device that helps to maintain a potential difference across a conductor

ক

Cell

খ

Battery

গ

Both 1 and 2

ঘ

Voltmeter

To move a unit positive charge from one point to another on a equipotential surface:

ক

work is done by the charge

খ

work is done on the charge

গ

no work is done on the charge

ঘ

work done is contants

Choose the correct statement about the roller of a van-de-Graaff generator.

ক

It attracts the opposite charge

খ

It rolls and rotate the belt

গ

Both are correct

ঘ

Both are wrong

The work done to move a charge on an equipotential surface is

ক

Infinity

খ

Less than 1

গ

Greater than 1

ঘ

Zero

Nature of equipotential surface for a point charge is

ক

Ellipsoid with charge at foci

খ

Sphere with charge at the centre of the sphere

গ

Sphere with charge on the surface of the sphere

ঘ

Plane with charge on the surface

A bird sitting on a high-power line

ক

Gets a fatal shock

খ

Gets a mild shock

গ

Gets killed instantly

ঘ

Is not affected practically

Why did people's hair stand on end when a person has touched the sphere of Van de Graaff generator?

ক

The positively charged (+) hair was repulsed by the positive charged (+) person and each other.

খ

The positively charged (+) hair was repulsed by the negatively charged (-) person and each other.

গ

The negatively charged (-) hair was repulsed by the negatively charged (-) person and each other.

ঘ

The negatively charged (-) hair was repulsed by the positively charged (+) person and each other.

There is a uniform electric field of intensity E which is as shown. How many labelled points have the same electric potential as the fully shaded point?

ক

8

খ

11

গ

2

ঘ

3

An electric field of 1000 V/m is applied to an electric dipole at angle of 45°. The value of electric dipole moment is 10-29 C-m. What is the potential energy of the electric dipole?

ক

-9 × 10-20 J

খ

-10 × 10-29 J

গ

-20 × 10-18 J

ঘ

-7 × 10-27 J

The heating element in an electric heater is made of which metal ?

ক

Nichrome

খ

Lead

গ

Silver

ঘ

Copper

Which of the following is NOT an electrical insulator?

ক

Gold

খ

Diamond

গ

Rubber

ঘ

Glass

Which one of the following statements is INCORRECT regarding Van de Graff generator?

ক

Can produce up to million volts

খ

Can accelerate particles like protons

গ

Can be used to study structure of matter

ঘ

Cannot be constructed inside a building

Which is correct in the following? In an electric circuit-

ক

Ammeter in parallel and Voltmeter in series are connected.

খ

Ammeter in series and Voltmeter in parallel are connected.

গ

Ammeter and Voltmeter both are connected in series when the voltage is small.

ঘ

Ammeter and Voltmeter both are connected in parallel when the voltage is very large

Which of the following statements regarding electrostatics of conductors is not true?

ক

At the surface of a charged conductor, electrostatic field must be normal to the surface at every point

খ

The interior of a conductor can have no excess charge in the static situation

গ

Electrostatic potential rises linearly from zero at the centre of the conductor to maximum at the surface

ঘ

Inside a conductor, electrostatic field is zero

The four options are given about an equipotential surface, which of the following is incorrect?

ক

The electric field is always perpendicular to an equipotential surface.

খ

For a point charge, the equipotential surfaces are concentric spherical shells.

গ

The direction of the equipotential surface is from low potential to high potential.

ঘ

Two equipotential surfaces can never intersect.