Question # 1

The SI unit of relative permittivity is.

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Fm-1

C2N-1m-2

Nm2C-2

No unit

The electric intensity due to two oppositely charged plates is

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None of these

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

In Millikan's oil drop experiment a charged particle of mass 'm' is in equilibrium in an will

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Zero

g/2

g

2g

Coulomb's force is:

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Conservative force

None conservative force

Similar to frictional force

None of the above

The amount of energy equal to 1.6 x 10^-18 J is called.

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One volt

One milli volt

One electron volt

One mega electron volt

An electric field cannot deflect

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X-rays

a-particles

ß-particles

None of these

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 number of electrons in one coulomb charge is equal to

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6.2 x 10¹⁸ electrons

Zero electrons

1.6 x 10^-22 electrons

6.2 x 10²¹ electrons

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

Dielectric constant _εr for air is:

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1

1.006

1.0002

1.0006

Selenium is a

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Insulator

Photoconductor

Conductor

First insulator then conductor

Special organs called ampullae of lorenzenite are present in.

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Bats

Cats

Dogs

Sharks

Flux through any closed surface is:

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1/ε²_∘ times the total charge enclosed in it

ε²_∘ time the total charge enclosed in it

1/ε_∘ ties the total charge enclosed in ti

ε_∘ time the total charge enclosed in it

The product of resistance and capacitanc eis.

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Velocity

Force

Acceleration

Time

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 leV =

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1.6x10-19C

1.6x10-11J

1.6x10-19J

1.6x10-11C

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