Question # 1

The electric field created by positive charge is

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Radially inward

Zero

Circular

Radially outward

S.I unit of strength of electric field is

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J/C

C/V

V/C

N/C

Force per unit charge is called:

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Gravitational force

Electric field intensity

Coulomb's force

None of these

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

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Decreases

Increases

Becomes zero

Becomes infinity

Concept of the electric field lines is introduced by

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Coulomb

Faraday

Einstein

Joseph henry

Metals are good conductors of electricity because they have

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Large number of bounded electrons

Small number of electrons

Large number of free electrons

Small number of free electrons

Identify the practical application of electrostatic force.

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Inkjet printer

x rays

Laser

A.C. Generator

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

Two parrallel, metal plates are a distance 8.00 m apart. The electric field between the plates in uniform, Directed toward the right , and has a magnitude of 4.00 N/C. If an ion of charge +2e is released at rest at the left-hand plate. What is its kinetic energy when reaches the right-hand plate?

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4 eV

64 eV

32 eV

16 eV

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

Which one of the following is correct

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All 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

Total flux through a closed surface depends on.

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Shape of surface

Medium only

Charge enclosed only

Charge and Medium

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

An ECG records the _____ between points on human skin generated by electric process i the heart.

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Heart beat

Pulse rate

Pressure

Voltage

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

Drum of photocopier is made of.

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Copper

Aluminum

Nickel

Cobalt

One of the applications of electrostatic induction is

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Laser

Photocopier

X ray machine

Wilson cloud chamber

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