Question # 1

Taking the earth to be a spherical conductor of diameter 12.8 x 10³km. Its capacity will be

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711μF

611μF

811μF

511μF

The resistivity of a substance depends upon the

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length

mass

area

temperature

The unit of conductance is

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ohm

meter

mho

ohm-meter

The electric flux from a closed surface

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Is independent of the shape of the surface

Depends on the charge enclosed by the surface

Both a and b

None of the above

If two bulbs one of 60 W and other of 100 W are connected in parallel, then which one of the following will flow more?

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60 W bulb

100 W bulb

Both equally

None of these

The capacity of a parallel plat capacitor depends on the

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Type to metal used

Thickness of plates

Potential applied across the plates

Separation between the plates

Consider a spherical shell of metal at he centre of which a positive point charge is kept

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The electric filed is zero outside the shell

The electric field is zero everywhere

The electric field is zero in the region inside the shell

The electric field is non-zero in both regions outside and inside the shell

Current provided by a battery is maximum when

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Internal resistance equal to external resistance

Internal resistance is greater than external resistance

Internal resistance is less then external resistance

None of these

If the distance of separation between two chares is increased, the electrical potential energy of the system will

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Increase

Decrease

May increase or decrease

Remain the same

The electric flux is linked with a surface will be maximum when

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The surface is held parallel to the electric field

The surface is held perpendicular to the electric field

The surface makes an angle of 45° with the electric field

All of the above

A condenser of capacity 50μF is charged to 10 V.The energy stored is

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1.25 x 10^-3J

3.75 x 10^-3J

2.5 x 10^-3J

5 x 10^-3J

The force between two chares 0.06 m apart is 5 N. If each charge is moved towards the other by 0.01 m, then the force between them will become

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7.20 N

11.25 N

22.50 N

45.00

A sheet of aluminium foil of negligible thickness is introduced between the plates of a capacitor. The capacitance of the capacitor

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Increases

Decreases

Remain unchanged

Becomes infinite

The electric potential at the surface of an atomic nucleus (Z = 50) of radius 9.0 x 10^-15is

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9 x 10⁵V

9 V

8 x 10⁶V

80 V

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