Question # 1

Electric potencial of earth is taken to be zero because the earth is good:

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Semiconductor

Conductor

Insulator

Dielectric

Gauss's law can only be applied to.

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A curved surface

A flat surface

A closed surface

A surface of any shape

The electric intensity at infinite distance from the point charge is

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Infinite

Zero

Positive

Negative

Electric intensity due to an infinite sheet of charge is:

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∂/2ε_∘

∂/rε_∘

∂/r2ε_∘

none of these

The electric intensity due to two oppositely charged plates is

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None of these

Total flux through a closed surface depends on.

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Shape of surface

Medium only

Charge enclosed only

Charge and Medium

Metals are good conductors of electricity because they have

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Large number of bounded electrons

Small number of electrons

Large number of free electrons

Small number of free electrons

If the separation between the plates of a capacitor is doubled then its capacitance become.

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Double

Half

One fourth

Three times

If the medium between the charges is not free space then electrostatic force will.be

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Increase

Decrease

Remain same

None of these

Which material should be inserted between the plates of a capacitor in order to increase its capacitance.

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Copper

Mica

Iron

Tin

The negative of the potential gradient is

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Electrostatic force

Electromotive force

Potential difference

Electric field intensity

Drum of photocopier is made of.

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Copper

Aluminum

Nickel

Cobalt

A one microfarad capacitor of a TV is subjected to 4000 V potencial difference.The energy stored in capacitor is:

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8 j

16 j

4 x 10^-3j

2 x 10^-3j

NC-1 is the SI unit is

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Force

Charge

Current

Electric intensity

The electrostatic force between two charges is 42 N, If we place a dielectric of E_y=2.1 between the charges then the force become equal to.

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42 N

88.2 N

20 N

2 N

The electric flux through closed surface depends upon

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Charge

Medium

Geometry

Charge and Medium

One of the applications of electrostatic induction is

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Laser

Photocopier

X ray machine

Wilson cloud chamber

Presence of dielectric between two charges always.

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Reduces the electric force

Enhance the electric force

Does not effect electric force

Double the electric force

Electric flux is a

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Vector quantity

Scalar quantity

Both (a) and (b)

None of above

Coulomb /volt is called.

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Farad

Ampere

Joule

Henry

The fact that electric field exist in space around an electrical charge is

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Electrical property

Gravitational property

Intrinsic property of nature

Extrinsic property of nature

Two parrallel, metal plates are a distance 8.00 m apart. The electric field between the plates in uniform, Directed toward the right , and has a magnitude of 4.00 N/C. If an ion of charge +2e is released at rest at the left-hand plate. What is its kinetic energy when reaches the right-hand plate?

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4 eV

64 eV

32 eV

16 eV

The "toner" of photocopier is given:

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Positive charge

Negative charge

Remains neutral

All of above

If a charge body moved against the electric field it will again

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Potential energy

K.E

Mechanical Energy

Electric potential energy

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