Question # 1

Charge on a capacitor is 50C. if voltage applied across its plates is 10V then its capacitance:

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5F

0.02F

500F

0.2F

The coulomb’s law is valid for the charges which are:

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Moving and point charges

Stationary and point charges

Moving and non-point charges

Stationary and large size charges

The relative permittivity of air is

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1

3.7

7.8

1.0006

Two charges of equal magnitudes and at a distance r exert a force F on each other. If the charges are halved and distance between them is doubled, then the new force acting on each charge is:

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F/8

F/4

F/16

4F

The electron is a cathode-ray tube are accelerated from cathode to anode by a potential differenceof 2000 V. If this p.d is increased to 8000 V, the electrons will arrive at the anode with:

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Twice the kinetic energy and four times the velocity

Four times the kinetic energy and twice the velocity

Four times the kinetic energy and sixteen times the velocity

Sixteen times the kinetic energy and four times the velocity

An electron is moving towards high potential. Its electrical P.E:

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Increases

Remains constant

Decrease

May increase may decrease

Two point charges repel each other with a force of 4× 𝟏𝟎−𝟓 newton at a distanceof meter. Two charges are

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Both positive

Alike

Both Negative

Unlike

When a dielectric is inserted between the plates of a capacitor, Which one is true

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Energy stored increase

Energy stored decrease

Capacitance decrease

All

Which one of the following statements regarding electrostatics is wrong?

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Charge is conserved

Charge is quantized

There is no field near an isolated charge at rest

A moving charge produces both electric and magnetic fields

Capacitor stores energy in the form of :

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Electric field

Both of these

Magnetic field

Gravitational field

The distance between the plates of a charged parallel plate capacitor is 4mm and potential difference is 6 volts. If the distance between the plates is increased to 12mm, then :

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The potential difference of the capacitor will become 18 volts

The P.D become 20 volts

The P.D will remain unchanged

The charge on condenser will reduce to one third

A charged conductor has charged on its:

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Outer surface

Surrounding surface

Inner surface

Middle point

If the distance between the plates of a parallel plates capacitor is increased, its potential will:

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Remain the same

Increase

Decrease

Decrease exponentially

Capacitance of a capacitor does not depend upon

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Separation between plates

Thickness of the plates

Area of the plates

Medium between the plates

Two point charges +2 coulombs and +6 coulombs repel each other with a force of 12 N if a charge -4 coulomb is given to each of these charges the force will be:

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4N repulsive

8N repulsive

4N attractive

8N attractive

Between the plates of a parallel plate condenser there is 1mm thick paper of dielectric constant 4. Itis charged at 100 volt. The electric field in volt/meter between the plates of the capacitor is:

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100

25000

100000

400000

An electric field can deflect:

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X-rays

Neutrons

𝛼 −particles

𝛾 −rays

A body gets positive charge. It means that:

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It has lost electrons

It has gained positions

It has gained protons

It has gained 𝛼 −particles

The relative permittivity of air is

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1

3.7

7.8

1.0006

A charge of 2C experiences a force 2000N in a uniform electric field. In this fieldthe potential difference between two points separated by a distance 1cm is

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2V

10V

5V

20V

Area under Q-V graph for a capacitor represents

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Charged stored

Energy stored

Electric field strength

Potential difference

A parallel plate air capacitor is charged and then isolated. When a dielectric material is inserted between the plates of the capacitor , then which of the following does not change:

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Electric field between the plates

Charge on the plates

Potential difference across the plate

Energy stored in the capacitor

The law, governing the force between electric charges is known as:

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Ampere’s law

Ohm’s law

Coulomb’s law

Faraday’s law65y7uhnb

A soap bubble is give a negative charge, then its radius:

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Decrease

Remains same

Increases

Bubble will disappear

If the magnitude of charge on each of two objects is doubled and the distance between them is also doubled then force between them:

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Doubled

Quadrupled

Halved

Remains same

The potential difference between head and tail of an "electric eel" can be upto.

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6V

60V

6000V

600V

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