Gamma Question Bank for Medical Physics>Chapter 20 - Magnetism and Matter>EXERCISE>Q 19

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Domain formation is a necessary feature of,

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Important Questions on Magnetism and Matter

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Gamma Question Bank for Medical Physics>Chapter 20 - Magnetism and Matter>EXERCISE>Q 20

Susceptibility of a magnetic substance is found to depend on temperature and the strength of the magnetising field. The material is a :-

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Gamma Question Bank for Medical Physics>Chapter 20 - Magnetism and Matter>EXERCISE>Q 21

The hysteresis curve is studied generally for

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Gamma Question Bank for Medical Physics>Chapter 20 - Magnetism and Matter>EXERCISE>Q 23

If the magnetic dipole moment of an atom of diamagnetic material, paramagnetic material and ferromagnetic material arc denoted by

μ_{d}, μ_{p}

and

μ_{f}

respectively, then

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Gamma Question Bank for Medical Physics>Chapter 20 - Magnetism and Matter>Assignment Set-1>Q 1

A paramagnetic sample shows net magnetisation of

18 A m^{- 1}

when placed in an external magnetic field of

0.9 T

at a temperature of

36 K .

When the same sample is placed in an external magnetic field of

0.3 T

at a temperature of

54 K,

the magnetisation will be

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Gamma Question Bank for Medical Physics>Chapter 20 - Magnetism and Matter>Assignment Set-1>Q 5

Substances which have a tendency to move from stronger to weaker part of external magnetic field are

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Gamma Question Bank for Medical Physics>Chapter 20 - Magnetism and Matter>Assignment Set-1>Q 6

The ratio of external magnetic field to the permeability of free space is called

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Gamma Question Bank for Medical Physics>Chapter 20 - Magnetism and Matter>Assignment Set-1>Q 7

Horizontal component

(B_{H}),

vertical component

(B_{v})

and angle of dip

(δ)

of earth are related as

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Gamma Question Bank for Medical Physics>Chapter 20 - Magnetism and Matter>Assignment Set-1>Q 8

A bar magnet made of steel has a magnetic moment of

1.5 A m^{2}

and a mass

6 \times 10^{- 3} kg .

If the density of steel is

8 \times 10^{3} kg m^{- 3}

then the intensity of magnetisation of the magnet is