Question # 1

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

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

The electric field in some region of of space is uniform in magnitude and direction. Which one of the following five statements best desccribes the volume charge density (ρ) , in this region of space?

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ρ = 0

ρ decreases linearly in the direction of the electric field

ρ increases linearly in the direction of the electric field

ρ has a uniform value throughout the region

Electric potencial of earth is taken to be zero because the earth is good:

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Semiconductor

Conductor

Insulator

Dielectric

If the medium between the charges is not free space then electrostatic force will.be

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Increase

Decrease

Remain same

None of these

Electric field intensity at a point is defined by the relation.

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E= q/F

E = F/q

E = qF

E = F/q2

Which one is photo conductor.

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Copper

Selenium

Mercury

Aluminium

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

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

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

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

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Parallel

Flat

Curved

Spherical

Drum of photocopier is made of.

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Copper

Aluminum

Nickel

Cobalt

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

The electric field lines are closer where the field is

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Strong

Weak

Uniform

Variable

The toner of printer is given

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Positive charge

Negative charge

Neutral

First positive then negative

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

The electric field created by positive charge is:

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Radially outward

Circular

Radially inward

Zero

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