Question # 1

One of the applications of electrostatic induction is

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Laser

Photocopier

X ray machine

Wilson cloud chamber

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

Two oppositely charged balls A and B attract the third ball C, when placed near them turn by turn The third ball C must be.

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Positively charged

Negatively charged

Electrically neutral

Positively and negatively charged

Net charge enclosed by Gaussian surface is:

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zero

maximum

depend on intensity

none of all

Special organs called ampullae of lorenzenite are present in.

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Bats

Cats

Dogs

Sharks

For computation of electric flux, the surface area should be.

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Parallel

Flat

Curved

Spherical

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

Electric flux is a:

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Scalar quantity

Vector quantity

Variable quantity

None of these

The electric field lines are closer where the field is

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Strong

Weak

Uniform

Variable

The SI unit of relative permittivity is.

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Fm-1

C2N-1m-2

Nm2C-2

No unit

Charge carriers in electrolytes are.

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Protons

Electrons

Holes

Positive and Negative ions

Photo copier and inkjet printer are the applications of

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Magnetism

Electricity

`.Electro magnetism

Electrostatics

NC-1 is the SI unit is

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Force

Charge

Current

Electric intensity

If F1 and F2 are teh magnetic forces acting on a particle and electron respectively when moving perpendicular to the magnetic field then.

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F1=F2

F1>F2

F1<F2

F1 = 4F2

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

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

The fact that electric field exist in space around an electrical charge is

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Electrical property

Gravitational property

Intrinsic property of nature

Extrinsic property of nature

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

Charge on electron is

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1.6 x 10^-19 C

1.6 x 10¹⁹C

1.6 x 10^-17C

1.6 x 10¹⁷C

A changing electric flux creates.

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Electric fields

Gravitational

Magnetic field

Electric charge

Concept of electric field lines was given by:

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Michelson

Henry

Michael faraday

Oersted

Dielectric constant _εr for air is:

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1

1.006

1.0002

1.0006

The capacitance of a capacitor depends upon.

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Thickness of plates

Charges on the plates

Voltage applied

Geometry of the capacitor

Electric flux is a

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Vector quantity

Scalar quantity

Both (a) and (b)

None of above

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