Question # 1

SI unit of electric flux is.

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NmC¹

Nm^-1 C¹

Nm²C^-1

Nm³C²

Identify the practical application of electrostatic force.

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Inkjet printer

x rays

Laser

A.C. Generator

The SI unit of relative permittivity is.

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Fm-1

C2N-1m-2

Nm2C-2

No unit

Capacitance of a capacitor does not depend upon.

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Distance between plates

Area of plates

Electric field between plates

Medium between plates

Selenium is a

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Insulator

Photoconductor

Conductor

First insulator then conductor

Net charge enclosed by Gaussian surface is:

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zero

maximum

depend on intensity

none of all

If the distance between the two charged bodies is halved, the force between them becomes.

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Double

Half

Four times

One times

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

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

A one microfarad capacitor of a TV is subjected to 4000 V potencial difference.The energy stored in capacitor is:

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8 j

16 j

4 x 10^-3j

2 x 10^-3j

The electric intensity at infinite distance from the point charge is

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Infinite

Zero

Positive

Negative

A charge Q is divided into tweo parts q and Q-q and seperated by a distance R. The force of equilibrium between them will be maximum when:

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q=Q/4

q=Q/2

q=Q

None of these

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

The total flux through a closed surface.

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Directly proportional to shape and geometry

Independent of medium

Depend on shape and geometry

Dependent on medium and the charge enclosed

Electric flux is a:

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Scalar quantity

Vector quantity

Variable quantity

None of these

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

S.I unit of strength of electric field is

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J/C

C/V

V/C

N/C

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

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Decreases

Increases

Becomes zero

Becomes infinity

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