Question # 1

Concept of the electric field lines is introduced by

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Coulomb

Faraday

Einstein

Joseph henry

Photo copier and inkjet printer are the applications of

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Magnetism

Electricity

`.Electro magnetism

Electrostatics

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

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

Electro encephalon graph is the diagnostic test for the working of.

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Eye

Heart

Brain

Lungs

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

In photocopier, then drum is coated with layer of.

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Aluminium

Copper

Selenium

silver

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

When the medium is insulator the elecrostatic force between the charges is

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Decreased

Zero

Increased

None of above

Total flux through a closed surface depends on.

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Shape of surface

Medium only

Charge enclosed only

Charge and Medium

The toner of printer is given

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Positive charge

Negative charge

Neutral

First positive then negative

The leV =

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1.6x10-19C

1.6x10-11J

1.6x10-19J

1.6x10-11C

One joule is equal to.

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1.6 x 10¹⁹ eV

1.6 x 10^-19 eV

6.25 x 10^-18 eV

6.25 x 10 ¹⁸ eV

The electrons in one coulomb change is equal to.

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1.6 x 10^-19

2.25 x 10^-19

6.25 x 10^-18

6.25 x 10^-19

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

The electric field created by positive charge is:

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Radially outward

Circular

Radially inward

Zero

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

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