The number of turns in a coil of Galvanometer is tripled, then

Voltage sensitivity remains constant and current sensitivity increases 3 times

Both voltage and current sensitivity remains constant

Voltage sensitivity increases 3 times and current sensitivity remains constant

Both voltage and current sensitivity decreases by 33 %

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CUET (UG)

IMPORTANT

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A rectangular loop carrying a current $i$ is situated near a long straight wire, such that the wire is parallel to one of the sides of the loop, and is in the plane of the loop. If a steady current $I$ is established in the wire as shown in the figure, the loop will

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Important Questions on Moving Charges and Magnetism

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CUET (UG)

IMPORTANT

Achieve CUET (UG) Physics Practice Book>Chapter 4 - Moving Charges and Magnetism>Exercise>Q 124

Two long straight conductors of length

1 m

each separated by a distance of half metre and carrying currents of

200 A

and

50 A

, respectively in opposite directions. Then the magnetic force between them is

EASY

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Achieve CUET (UG) Physics Practice Book>Chapter 4 - Moving Charges and Magnetism>Exercise>Q 125

An electron of charge

e

moves in a circular orbit of radius

r

around the nucleus at a frequency

ν

. The magnetic moment associated with the orbital motion of the electron is

EASY

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IMPORTANT

Achieve CUET (UG) Physics Practice Book>Chapter 4 - Moving Charges and Magnetism>Exercise>Q 126

Magnetic induction at the centre of a circular loop of area

π m^{2}

is 0.1 T. The magnetic moment of the loop is

(μ_{0} = p e r m e a b i l i t y o f a i r)

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Achieve CUET (UG) Physics Practice Book>Chapter 4 - Moving Charges and Magnetism>Exercise>Q 127

A conducting circular loop of radius

r

carries a constant current

i

. It is placed in a uniform magnetic field

B

such that

B

is perpendicular to the plane of the loop. The magnetic torque acting on the loop is-

EASY

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IMPORTANT

Achieve CUET (UG) Physics Practice Book>Chapter 4 - Moving Charges and Magnetism>Exercise>Q 128

An irregular closed loop carrying a current has a shape such that the entire loop cannot lie in a single plane. If this is placed in a uniform magnetic field, the force acting on the loop:

EASY

CUET (UG)

IMPORTANT

Achieve CUET (UG) Physics Practice Book>Chapter 4 - Moving Charges and Magnetism>Exercise>Q 129

The number of small magnetic dipoles in a solenoid is proportional to

HARD

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IMPORTANT

Achieve CUET (UG) Physics Practice Book>Chapter 4 - Moving Charges and Magnetism>Exercise>Q 130

A point

P

lies on the axis of a flat coil carrying a current. The magnetic moment of the coil is

μ

. The distance of

P

from the coil is

d

, which is large compared to the radius of the coil. The magnetic field at

P

has magnitude

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CUET (UG)

IMPORTANT

Achieve CUET (UG) Physics Practice Book>Chapter 4 - Moving Charges and Magnetism>Exercise>Q 131

The torque required to hold a small circular coil of

10

turns, area

1 {mm}^{2}

and carrying a current of

\frac{21}{44} A

in the middle of a long solenoid of

10^{3} turns / m

carrying current of

2.5 A

with its axis perpendicular to the axis of the solenoid is
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A rectangular loop carrying a current i is situated near a long straight wire, such that the wire is parallel to one of the sides of the loop, and is in the plane of the loop. If a steady current I is established in the wire as shown in the figure, the loop will

Important Questions on Moving Charges and Magnetism

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A rectangular loop carrying a current $i$ is situated near a long straight wire, such that the wire is parallel to one of the sides of the loop, and is in the plane of the loop. If a steady current $I$ is established in the wire as shown in the figure, the loop will