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Important Questions on Magnetism and Matter

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Physics>Electricity and Magnetism>Magnetism and Matter>Magnetization and Magnetic Intensity

25 cm

long solenoid has the radius

2 cm

and

500

turns. It carries a current of

15 A

. If it is equivalent to a magnet of the same size and magnetization

\vec{M} (\frac{M a g n e t i c m o m e n t}{v o l u m e}),

then

|\vec{M}|

is:

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Physics>Electricity and Magnetism>Magnetism and Matter>Magnetization and Magnetic Intensity

The relative permeability is represented by

μ_{r}

and the susceptibility is denoted by

χ

for a magnetic substance. Then, for a paramagnetic substance

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Physics>Electricity and Magnetism>Magnetism and Matter>Magnetization and Magnetic Intensity

μ_{0}

is permeability of vacuum,

χ_{m}

is susceptibility then permeability of material is

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Physics>Electricity and Magnetism>Magnetism and Matter>Magnetization and Magnetic Intensity

Following plots show Magnetization $(M)$ vs Magnetising field $(H)$ and Magnetic susceptibility $(χ)$ vs Temperature $(T)$ graph :

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Which of the following combination will be represented by a diamagnetic material?

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Physics>Electricity and Magnetism>Magnetism and Matter>Magnetization and Magnetic Intensity

A paramagnetic sample shows a net magnetisation of

6 A m^{- 1}

when it is placed in an external magnetic field of

0.4 T

at a temperature of

4 K

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

0.3 T

at a temperature of

24 K

, then the magnetisation will be :

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Physics>Electricity and Magnetism>Magnetism and Matter>Magnetization and Magnetic Intensity

The property of the substance which shows how easily a substance can be magnetized, when placed in a magnetic field is called

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Physics>Electricity and Magnetism>Magnetism and Matter>Magnetization and Magnetic Intensity

A solenoid has core of a material with relative permeability

501

and its windings carry a current of

1 A .

The number of turns of the solenoid is

500 m^{- 1}

. The magnetisation of the material is

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Physics>Electricity and Magnetism>Magnetism and Matter>Magnetization and Magnetic Intensity

A paramagnetic material has

10^{28} atoms m^{- 3}

. Its magnetic susceptibility at temperature

350 K

2.8 \times 10^{- 4}

. Its susceptibility at

300 K

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Physics>Electricity and Magnetism>Magnetism and Matter>Magnetization and Magnetic Intensity

An iron rod of susceptibility

599

is subjected to a magnetising field of

1200 A m^{- 1}

. The permeability of the material of the rod is:

(μ_{0} = 4 π \times 10^{- 7} T m A^{- 1})

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Physics>Electricity and Magnetism>Magnetism and Matter>Magnetization and Magnetic Intensity

Magnetization of the sample is

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Physics>Electricity and Magnetism>Magnetism and Matter>Magnetization and Magnetic Intensity

The unit of magnetic flux density is

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Physics>Electricity and Magnetism>Magnetism and Matter>Magnetization and Magnetic Intensity

The magnetization of bar magnet of length

5 cm

, cross-sectional area

2 {cm}^{2}

and net magnetic moment

1 A m^{2}

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Physics>Electricity and Magnetism>Magnetism and Matter>Magnetization and Magnetic Intensity

Magnetic susceptibility for a paramagnetic and diamagnetic material is respectively

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Physics>Electricity and Magnetism>Magnetism and Matter>Magnetization and Magnetic Intensity

The magnetic susceptibility of a material of a rod is

499 .

Permeability in vacuum is

4 π \times 10^{- 7} {Hm}^{- 1} .

Absolute permeability of the material of the rod is

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Physics>Electricity and Magnetism>Magnetism and Matter>Magnetization and Magnetic Intensity

The magnetic susceptibility is negative for:

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Physics>Electricity and Magnetism>Magnetism and Matter>Magnetization and Magnetic Intensity

Consider the regular array of vertical identical current-carrying wires (with the direction of current flow as indicated in the figure below) protruding through a horizontal table. If we scatter some diamagnetic particles on the table, they are likely to accumulate-

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