Physics Crash Course JEE Main>Chapter 15 - Magnetic Effects of Current and Magnetism>Level 1>Q 38

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IMPORTANT

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A long solenoid carrying a current $I$ is placed with its axis vertical as shown in the figure. A particle of mass $m$ and charge $q$ is released from the top of the solenoid. Its acceleration is $(g$ being acceleration due to gravity $)$

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Important Questions on Magnetic Effects of Current and Magnetism

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JEE Main

IMPORTANT

Physics Crash Course JEE Main>Chapter 15 - Magnetic Effects of Current and Magnetism>Level 1>Q 39

When the number of turns in a toroidal coil is doubled, then the value of magnetic flux density will becomes

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Physics Crash Course JEE Main>Chapter 15 - Magnetic Effects of Current and Magnetism>Level 1>Q 40

The magnetic length of a dipole is

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Physics Crash Course JEE Main>Chapter 15 - Magnetic Effects of Current and Magnetism>Level 1>Q 41

The magnetic induction field strength due to a short bar magnet at a distance

0.20 m

on the equatorial line is

20 \times 10^{- 6} T

. The magnetic moment of the bar magnet is

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Physics Crash Course JEE Main>Chapter 15 - Magnetic Effects of Current and Magnetism>Level 1>Q 42

The net magnetic moment of two identical magnets each of magnetic moment

M_{0}

, inclined at

60 °

with each other is

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Physics Crash Course JEE Main>Chapter 15 - Magnetic Effects of Current and Magnetism>Level 1>Q 43

What is the magnitude of the torque in $N m$ acting on a solenoid which has a magnetic moment of $0 .65 J T^{- 1}$ when its axis makes an angle of $30 °$ with the direction of the applied uniform horizontal magnetic field of $0 .25 T$ ?

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Physics Crash Course JEE Main>Chapter 15 - Magnetic Effects of Current and Magnetism>Level 1>Q 44

Find the maximum torque of a loop with magnetic moment

12.5

and flux density

4

units.

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Physics Crash Course JEE Main>Chapter 15 - Magnetic Effects of Current and Magnetism>Level 1>Q 45

A circular current loop of magnetic moment

M

is in an arbitrary orientation in an external uniform magnetic field

\vec{B}

. The work done to rotate the loop by

30 °

about an axis perpendicular to its plane is

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Physics Crash Course JEE Main>Chapter 15 - Magnetic Effects of Current and Magnetism>Level 1>Q 46

The magnetic moment of a square coil having

5

turns, each side measuring

4 cm

and carrying a current of unit ampere is