Question # 1

The electric intensity at infinite distance from the point charge is

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Infinite

Zero

Positive

Negative

Due to polarization, electric field E.

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Increase

Decrease

First increases then decreases

Remain same

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

The SI unit of relative permittivity is.

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Fm-1

C2N-1m-2

Nm2C-2

No unit

Coulomb's force is:

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Conservative force

None conservative force

Similar to frictional force

None of the above

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 "toner" of photocopier is given:

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Positive charge

Negative charge

Remains neutral

All of above

If F1 and F2 are teh magnetic forces acting on a particle and electron respectively when moving perpendicular to the magnetic field then.

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F1=F2

F1>F2

F1<F2

F1 = 4F2

When some di electric is inserted between the plates of a capacitor, then capacitance.

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Decreases

Increases

Becomes zero

Becomes infinity

The toner of printer is given

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Positive charge

Negative charge

Neutral

First positive then negative

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

Photo copier and inkjet printer are the applications of

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Magnetism

Electricity

`.Electro magnetism

Electrostatics

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

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

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

Which one is photo conductor.

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Copper

Selenium

Mercury

Aluminium

S.I unit of strength of electric field is

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J/C

C/V

V/C

N/C

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