Question # 1

The process of copying is:

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Axillugraphy

Chromatography

Xerography

Spectrography

A changing electric flux creates.

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Electric fields

Gravitational

Magnetic field

Electric charge

A capacitor is charged with a battery and then it is disconnected. A slab of dielectric is now inserted between the plates, Then

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The charge in the plates reduces and potencial difference increase

Potencial difference between the plates increase, stored energy decreases and charge remains the same

Potencial difference between the plates decreases, stored energy decreases and charge remains unchanged

None of them

One of the applications of electrostatic induction is

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Laser

Photocopier

X ray machine

Wilson cloud chamber

Photo copier and inkjet printer are the applications of

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Magnetism

Electricity

`.Electro magnetism

Electrostatics

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

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Eye

Heart

Brain

Lungs

Dielectric constant _εr for air is:

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1

1.006

1.0002

1.0006

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

Two parrallel, metal plates are a distance 8.00 m apart. The electric field between the plates in uniform, Directed toward the right , and has a magnitude of 4.00 N/C. If an ion of charge +2e is released at rest at the left-hand plate. What is its kinetic energy when reaches the right-hand plate?

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4 eV

64 eV

32 eV

16 eV

A one microfarad capacitor of a TV is subjected to 4000 V potencial difference.The energy stored in capacitor is:

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8 j

16 j

4 x 10^-3j

2 x 10^-3j

Electric flux is a

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Vector quantity

Scalar quantity

Both (a) and (b)

None of above

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

Two metallic sphere of radius 2 cm and 4 cm get equal quantity of charge. Which has greater surface charge density ?

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2^nd sphere

Both have same

First sphere

None of these

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

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Decreased

Zero

Increased

None of above

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

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

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Parallel

Flat

Curved

Spherical

Identify the practical application of electrostatic force.

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Inkjet printer

x rays

Laser

A.C. Generator

Selenium is a

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Insulator

Photoconductor

Conductor

First insulator then conductor

Some charge is being given to a conductor. Then its potencial

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Its maximum at surface

Its maximum at Its maximum at center

Is remain same throughout the conductor

Is maximum somewhere between surface and centre

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

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

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Semiconductor

Conductor

Insulator

Dielectric

The leV =

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1.6x10-19C

1.6x10-11J

1.6x10-19J

1.6x10-11C

The middle region of electric field is:

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Maximum field spot

Zero field spot

Perpendicular field spot

All of above

If the potential difference across two plates of capacitor is doubled, then energy stored in it will be.

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Two times

Eight times

Four times

Remain same

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