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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IMPORTANT

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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

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Important Questions on Moving Charges and Magnetism

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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-

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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:

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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

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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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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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Achieve CUET (UG) Physics Practice Book>Chapter 4 - Moving Charges and Magnetism>Exercise>Q 132

A magnetic dipole is acted upon by two magnetic fields which are inclined to each other at an angle of

75^{o}

. One of the fields has a magnitude of

15 mT

. The dipole attains stable equilibrium at an angle of

30^{o}

with this field. The magnitude of the other field (in

mT

) is close to

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Achieve CUET (UG) Physics Practice Book>Chapter 4 - Moving Charges and Magnetism>Exercise>Q 133

The dipole moment of a circular loop carrying a current I, is m and the magnetic field at the centre of the loop is

B_{1}

. When the dipole moment is doubled by keeping the current constant, the magnetic field at the centre of the loop is

B_{2}

. The ratio

\frac{B_{1}}{B_{2}}

is:

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

Important Questions on Moving Charges and Magnetism

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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