Question # 1

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

The work done is bringing a unit positive charge from infinity to that point in an electric field is called.

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Potential

Potential difference

Absolute potential

All of these

A capacitor stores energy in the form of.

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Magnetic field

Heat energy

Electrical energy

Mechanical energy

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

S.I unit of strength of electric field is

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J/C

C/V

V/C

N/C

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

Identify the practical application of electrostatic force.

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Inkjet printer

x rays

Laser

A.C. Generator

The negative of the potential gradient is

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Electrostatic force

Electromotive force

Potential difference

Electric field intensity

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

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

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

Electric flux is a:

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Scalar quantity

Vector quantity

Variable quantity

None of these

Electric flux is a

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Vector quantity

Scalar quantity

Both (a) and (b)

None of above

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

NC-1 is the SI unit is

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Force

Charge

Current

Electric intensity

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

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

Selenium is

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Insulator is dark

Insulator in light

Conductor in dark

Semi conductor in dark

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