Question # 1

One electron volt is equal to.

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1.6 x 10^-19 Joule

1.6 x 10^-19Coulomb

1.6 x 10^-12N

1.6 x 10¹⁸Joule

A capacitor is charged with a battery and then it is disconnected. A slab of dielectric is now inserted between the plates, Then

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The charge in the plates reduces and potencial difference increase

Potencial difference between the plates increase, stored energy decreases and charge remains the same

Potencial difference between the plates decreases, stored energy decreases and charge remains unchanged

None of them

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

Selenium is a

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Insulator

Photoconductor

Conductor

First insulator then conductor

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 process of copying is:

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Axillugraphy

Chromatography

Xerography

Spectrography

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

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 force between two charge is 28 N. If paraffin wax of relative permittivity 2.8 is introduced between the charges as medium, then the force reduces to.

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25 N

20 N

10 N

15 N

The SI unit of relative permittivity is.

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Fm-1

C2N-1m-2

Nm2C-2

No unit

If a charged body is moved against the electric field it will gain.

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P.E.

K.E.

Mechanical energy

Electrical potential energy

The electric intensity due to two oppositely charged plates is

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None of these

Electric intensity due to an infinite sheet of charge is:

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∂/2ε_∘

∂/rε_∘

∂/r2ε_∘

none of these

S.I unit of strength of electric field is

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J/C

C/V

V/C

N/C

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

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

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 electric field created by positive charge is:

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Radially outward

Circular

Radially inward

Zero

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