Physics Crash Course NEET>Chapter 14 - Magnetic Effects of Current and Magnetism>Level 2>Q 74

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If the magnetic dipole moment of an atom of diamagnetic material, paramagnetic material and ferromagnetic material is denoted by $μ_{d}, μ_{p}$ and $μ_{f}$ respectively, then

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Important Questions on Magnetic Effects of Current and Magnetism

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Physics Crash Course NEET>Chapter 14 - Magnetic Effects of Current and Magnetism>Level 2>Q 75

A bar magnet of dipole moment

10^{4} {JT}^{- 1}

is free to rotate in a horizontal plane. A horizontal magnetic field

4 \times 10^{- 5} T

exists in space. Find the work done in rotating the magnet slowly from a direction parallel to the field to a direction of

60 °

with the field.

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Physics Crash Course NEET>Chapter 14 - Magnetic Effects of Current and Magnetism>Level 2>Q 76

The value of earth magnetic field

B_{H} = 0.3 G

. In this magnetic field a magnet is oscillating with

5 oscillations \min^{- 1}

. To increase the oscillation of magnet upto

10 oscillations \min^{- 1}

, the value of earth magnetic field is increased by

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Physics Crash Course NEET>Chapter 14 - Magnetic Effects of Current and Magnetism>Level 2>Q 77

A dip needle vibrates in the vertical plane perpendicular to the magnetic meridian. The time period of vibration is found to be

2 s

. The same needle is then allowed to vibrate in the horizontal plane and the time period is again found to be

2 s

. Then the angle of dip is

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Physics Crash Course NEET>Chapter 14 - Magnetic Effects of Current and Magnetism>Level 2>Q 78

The materials suitable for making electromagnets should have

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Physics Crash Course NEET>Chapter 14 - Magnetic Effects of Current and Magnetism>Level 2>Q 79

The ratio of intensity of magnetization and magnetizing field is called

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Physics Crash Course NEET>Chapter 14 - Magnetic Effects of Current and Magnetism>Level 2>Q 80

Nickel shows the ferromagnetic property at room temperature. If the temperature is increased beyond Curie temperature, then it will show

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Physics Crash Course NEET>Chapter 14 - Magnetic Effects of Current and Magnetism>Level 2>Q 81

If a diamagnetic substance is brought near north or south pole of a bar magnet, it is,

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Physics Crash Course NEET>Chapter 14 - Magnetic Effects of Current and Magnetism>Level 2>Q 82

If

X

is the magnetic susceptibility and

T

is the Curie's temperature. Then, the correct curve between

X

and

\frac{1}{T}

for a paramagnetic material is: