Question # 1

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

The capacitance of a capacitor depends upon.

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Thickness of plates

Charges on the plates

Voltage applied

Geometry of the capacitor

The electrostatic force between two charges is 42 N, If we place a dielectric of E_y=2.1 between the charges then the force become equal to.

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42 N

88.2 N

20 N

2 N

Drum of photocopier is made of.

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Copper

Aluminum

Nickel

Cobalt

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

A capacitor stores energy in the form of.

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Magnetic field

Heat energy

Electrical energy

Mechanical energy

Dielectric constant _εr for air is:

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1

1.006

1.0002

1.0006

The electric field created by positive charge is

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Radially inward

Zero

Circular

Radially outward

Due to polarization, electric field E.

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Increase

Decrease

First increases then decreases

Remain same

Concept of electric field lines was given by:

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Michelson

Henry

Michael faraday

Oersted

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

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

A capacitor is perfect in insulator for.

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Alternating current

Sparking current

Eddy current

Direct current

A force of 0.01 N is exerted on a charge 1.2 x 10^-5 C at a certain point. The electric field at that point is

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1.2 x 10⁴ N/C

1.2 x 10⁴ C/N

8.3 x 10² N/C

8.3 x 10^-2 N/C

A charge on 4 coulomb is in the field of intensity 4N/C the force on the charge is.

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Uniform

Non uniform

Weak

Strong

The SI unit of relative permittivity is.

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Fm-1

C2N-1m-2

Nm2C-2

No unit

Force per unit charge is called:

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Gravitational force

Electric field intensity

Coulomb's force

None of these

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

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Physics ICS Part 2 Chapter 12 Online MCQ's Test MCQs With Answers

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