Question # 1

The electric intensity due to two oppositely charged plates is

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None of these

The electric field created by positive charge is:

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Radially outward

Circular

Radially inward

Zero

If the distance between the two charged bodies is halved, the force between them becomes.

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Double

Half

Four times

One times

Force per unit charge is called:

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Gravitational force

Electric field intensity

Coulomb's force

None of these

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

The capacitance of a capacitor depends upon.

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Thickness of plates

Charges on the plates

Voltage applied

Geometry of the capacitor

Which one is photo conductor.

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Copper

Selenium

Mercury

Aluminium

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

The toner of printer is given

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Positive charge

Negative charge

Neutral

First positive then negative

Which one of the following is correct

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All of above

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 both the magnitude of charges and distance between them is doubled, then coulomb's force will be.

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Doubled

Hlaf

Remain same

One fourth

The middle region of electric field is:

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Maximum field spot

Zero field spot

Perpendicular field spot

All of above

A proton is about 1840 time than an electron. When it is accelerated by a potencial difference if 1 kV, its kinetic energy will be:

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1884 ke V

1/1840 keV

1 keV

920 keV

The relative permitivity of air is

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79.5

1.006

1.06

1.0006

The photo copying process is called

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Xerography

Inkjet Printer

Both (a) and (b)

None of these

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

In Millikan's oil drop experiment a charged particle of mass 'm' is in equilibrium in an will

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Zero

g/2

g

2g

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