MEDIUM

Earn 100

Explain why a charged balloon is repelled by another charged balloon whereas an uncharged balloon is attracted by a charged balloon.

Important Questions on Electricity and Magnetism

EASY

Physics>Electromagnetism- 1>Electricity and Magnetism>Electric Charge

The fundamental particles present in the nucleus of an atom are

MEDIUM

Physics>Electromagnetism- 1>Electricity and Magnetism>Electric Charge

A body has a negative charge of

1 μc

. It means the body has gained:

EASY

Physics>Electromagnetism- 1>Electricity and Magnetism>Electric Charge

Calculate the number of electrons constituting one coulomb of charge.

EASY

Physics>Electromagnetism- 1>Electricity and Magnetism>Electric Charge

A body is said to have positive charge if it repels an ebonite rod rubbed with fur.

MEDIUM

Physics>Electromagnetism- 1>Electricity and Magnetism>Electric Charge

Two metallic spheres of radii

1 cm

and

2 cm

are given charges of

10^{- 2} C

and

5 \times 10^{- 2} C

, respectively. If these are connected by a conducting wire, the final charge on the smaller sphere is

EASY

Physics>Electromagnetism- 1>Electricity and Magnetism>Electric Charge

A negatively charged object repels another charged object held near it. What is the nature of charge on the other object?

MEDIUM

Physics>Electromagnetism- 1>Electricity and Magnetism>Electric Charge

An ebonite rod rubbed with fur is suspended near another ebonite rod rubbed with fur. State your observation and give a reason to support your answer.

MEDIUM

Physics>Electromagnetism- 1>Electricity and Magnetism>Electric Charge

Describe an activity to show that opposite charges attract.

MEDIUM

Physics>Electromagnetism- 1>Electricity and Magnetism>Electric Charge

You are given two similar bars. One is a magnet and the other is of soft iron. How will you distinguish and identify them?

EASY

Physics>Electromagnetism- 1>Electricity and Magnetism>Electric Charge

When a glass rod is rubbed with a silk cloth, charges appear on both. A similar phenomenon is observed with many other pairs of bodies. Explain how this observation is consistent with the law of conservation of charge.

MEDIUM

Physics>Electromagnetism- 1>Electricity and Magnetism>Electric Charge

It is now believed that protons and neutrons (which constitute nuclei of ordinary matter) are themselves built out of more elementary units called quarks. A proton and a neutron consist of three quarks each. Two types of quarks, the so called ‘up’ quark (denoted by

u

) of charge

+ (2 / 3) e,

and the ‘down’ quark (denoted by

d

) of charge

(- 1 / 3) e,

together with electrons build up ordinary matter. (Quarks of other types have also been found which give rise to different unusual varieties of matter.) Suggest a possible quark composition of a proton and neutron.

EASY

Physics>Electromagnetism- 1>Electricity and Magnetism>Electric Charge

Two metallic spheres of same mass are given equal and opposite charges. Then,

EASY

Physics>Electromagnetism- 1>Electricity and Magnetism>Electric Charge

A positively charged object repels another charged object kept close to it. What is the nature of charge on the other object?

EASY

Physics>Electromagnetism- 1>Electricity and Magnetism>Electric Charge

A conductor has been given a charge

- 3 \times 10^{- 7} C

by transferring electrons. Mass increase (in

kg

) of the conductor and the number of electrons added to the conductor are, respectively

MEDIUM

Physics>Electromagnetism- 1>Electricity and Magnetism>Electric Charge

How will you test whether a given rod is a magnet or not?

MEDIUM

Physics>Electromagnetism- 1>Electricity and Magnetism>Electric Charge

What will you observe when the metal top of an electroscope is touched with a positively charged object?

EASY

Physics>Electromagnetism- 1>Electricity and Magnetism>Electric Charge

Assertion: When charges are shared between two bodies, there occurs no loss of charge, but there does occur a loss of energy.

Reason: In case of sharing of charges conservation of energy fails.

EASY

Physics>Electromagnetism- 1>Electricity and Magnetism>Electric Charge

If a body is charged by rubbing it, its weight -

EASY

Physics>Electromagnetism- 1>Electricity and Magnetism>Electric Charge

A negatively charged object attracts another charged object placed near it. What is the nature of charge on the other object?

HARD

Physics>Electromagnetism- 1>Electricity and Magnetism>Electric Charge

The concentric, conducting spherical shells

X, Y

and

Z

with radii

r, 2 r

and

3 r,

respectively.

X

and

Z

are connected by a conducting wire and

Y

is uniformly charged to charge

Q

as shown in figure. Charges on shells

X

and

Z

will be

Explain why a charged balloon is repelled by another charged balloon whereas an uncharged balloon is attracted by a charged balloon.

Important Questions on Electricity and Magnetism

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