Question # 1

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

Selenium is

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Insulator is dark

Insulator in light

Conductor in dark

Semi conductor in dark

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

SI unit of electric flux is.

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NmC¹

Nm^-1 C¹

Nm²C^-1

Nm³C²

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

Concept of electric field lines was given by:

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Michelson

Henry

Michael faraday

Oersted

The electric field created by positive charge is

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Radially inward

Zero

Circular

Radially outward

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

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Semiconductor

Conductor

Insulator

Dielectric

Electron volt is the unit of.

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Potential

Potential difference

Electric current

Electric energy

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

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

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

If a charged body is moved against the electric field it will gain.

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P.E.

K.E.

Mechanical energy

Electrical potential energy

The SI unit of relative permittivity is.

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Fm-1

C2N-1m-2

Nm2C-2

No unit

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

The "toner" of photocopier is given:

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Positive charge

Negative charge

Remains neutral

All of above

Special organs called ampullae of lorenzenite are present in.

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Bats

Cats

Dogs

Sharks

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