Question # 1

Drum of photocopier is made of.

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Copper

Aluminum

Nickel

Cobalt

The electric field lines are closer where the field is

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Strong

Weak

Uniform

Variable

Dielectric constant _εr for air is:

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1

1.006

1.0002

1.0006

S.I unit of strength of electric field is

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J/C

C/V

V/C

N/C

Due to polarization, electric field E.

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Increase

Decrease

First increases then decreases

Remain same

Which one of the following is correct

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All of above

Identify the practical application of electrostatic force.

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Inkjet printer

x rays

Laser

A.C. Generator

Coulomb's force is:

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Conservative force

None conservative force

Similar to frictional force

None of the above

The capacitance of a capacitor depends upon.

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Thickness of plates

Charges on the plates

Voltage applied

Geometry of the capacitor

Presence of dielectric always.

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Increase the electrostatic force

Reduces the electrostatic force

Do not effect electrostatic force

Doubles the electrostatic force

The force of Neutron due to field of 10² N/C is.

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1.6 x 10^-17N

1.6 x 10^-19N

Zero

1.6 x 10^-21N

The net charge on a capacitor magnitude of charge of charge

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Infinity

2 q

Q/2

Zero

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

The product of resistance and capacitanc eis.

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Velocity

Force

Acceleration

Time

If both the magnitude of charges and distance between them is doubled, then coulomb's force will be.

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Doubled

Hlaf

Remain same

One fourth

One of the applications of electrostatic induction is

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Laser

Photocopier

X ray machine

Wilson cloud chamber

The number of lines per unit area passing perpendicular through an area is called

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Flux

Electric intensity

Both (a) , (b)

None of these

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