Question # 1

The electric field in some region of of space is uniform in magnitude and direction. Which one of the following five statements best desccribes the volume charge density (ρ) , in this region of space?

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ρ = 0

ρ decreases linearly in the direction of the electric field

ρ increases linearly in the direction of the electric field

ρ has a uniform value throughout the region

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

Farad is defined as

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"Coulomb/Volt

Ampere /Volt

Coulomb /Joule

Volt/Coulomb

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

For computation of electric flux, the surface area should be.

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Parallel

Flat

Curved

Spherical

Dielectric constant _εr for air is:

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1

1.006

1.0002

1.0006

Which one of the following is correct

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All of above

Electric flux is a

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Vector quantity

Scalar quantity

Both (a) and (b)

None of above

The electric potential at a mid point in an electric dipole is.

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0 V

0.5 V

1 V

1.5 V

The net charge on a capacitor magnitude of charge of charge

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Infinity

2 q

Q/2

Zero

An electric field cannot deflect

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X-rays

a-particles

ß-particles

None of these

Electric intensity due to an infinite sheet of charge is:

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∂/2ε_∘

∂/rε_∘

∂/r2ε_∘

none of these

Net charge enclosed by Gaussian surface is:

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zero

maximum

depend on intensity

none of all

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 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

Electric potential at a distance ''r'' from ''q'' is:

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V_r = 1/54πε_∘q/r₂

Vr=1/4πε_∘²q/r

V_r=1/4πε_∘2q/r

V_r=1/4πε_∘q²/r

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

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

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