EASY

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Distinguish between diamagnetic and paramagnetic substances.

Important Questions on Magnetism and Matter

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Physics>Electricity and Magnetism>Magnetism and Matter>Magnetic Properties of Materials

Magnetic susceptibility of a paramagnetic substance is

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Physics>Electricity and Magnetism>Magnetism and Matter>Magnetic Properties of Materials

The magnetic susceptibility is negative for:

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Physics>Electricity and Magnetism>Magnetism and Matter>Magnetic Properties of Materials

The magnetization of bar magnet of length

5 cm

, cross-sectional area

2 {cm}^{2}

and net magnetic moment

1 A m^{2}

EASY

Physics>Electricity and Magnetism>Magnetism and Matter>Magnetic Properties of Materials

Which one of the following characteristics is not associated with a paramagnetic material?

MEDIUM

Physics>Electricity and Magnetism>Magnetism and Matter>Magnetic Properties of Materials

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-

Question Image

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Physics>Electricity and Magnetism>Magnetism and Matter>Magnetic Properties of Materials

Coercivity of a magnet where the ferromagnet gets completely demagnetized is

3 \times 10^{3} {Am}^{- 1}

. The minimum current required to be passed in a solenoid having

1000

turns per metre, so that the magnet gets completely demagnetized when placed inside the solenoid is

MEDIUM

Physics>Electricity and Magnetism>Magnetism and Matter>Magnetic Properties of Materials

A domain in ferromagnetic iron in the form of cube is having

5 \times 10^{5}

atoms. If the side length of this domain is

1.5 μm

and each atom has a dipole moment of

8 \times 10^{- 24} A m^{2}

, then magnetisation of domain is

MEDIUM

Physics>Electricity and Magnetism>Magnetism and Matter>Magnetic Properties of Materials

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})

EASY

Physics>Electricity and Magnetism>Magnetism and Matter>Magnetic Properties of Materials

An example of a perfect diamagnet is a superconductor. This implies that when a superconductor is put in a magnetic field of intensity

B

, the magnetic field

B_{s}

inside the superconductor will be such that

HARD

Physics>Electricity and Magnetism>Magnetism and Matter>Magnetic Properties of Materials

Nickel

(Z = 28)

combines with a uninegative monodentate ligand to form a diamagnetic complex

{[{NiL}_{4}]}^{2 -} .

The hybridisation involved and the number of unpaired electrons present in the complex are respectively:

EASY

Physics>Electricity and Magnetism>Magnetism and Matter>Magnetic Properties of Materials

Magnetic materials used for making permanent magnets $(P)$ and magnets in a transformer $(T)$ have different properties of the following, which property best matches for the type of magnet required?

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Physics>Electricity and Magnetism>Magnetism and Matter>Magnetic Properties of Materials

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>Magnetic Properties of Materials

A perfectly diamagnetic sphere has a small spherical cavity at its centre, which is filled with a paramagnetic substance. The whole system is placed in a uniform magnetic field $\vec{B}$ . Then the field inside the paramagnetic substance is:

Question Image

MEDIUM

Physics>Electricity and Magnetism>Magnetism and Matter>Magnetic Properties of Materials

The figure gives experimentally measured

B

vs.

H

variation in a ferromagnetic material. The retentivity, coercivity and saturation, respectively, of the material are:

EASY

Physics>Electricity and Magnetism>Magnetism and Matter>Magnetic Properties of Materials

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>Magnetic Properties of Materials

The meniscus of a liquid contained in one of the limbs of a narrow U -tube is placed between the poles of an electromagnet with the meniscus in a line with the field. The liquid is seen to rise to the line. This indicate that the liquid is ___ .

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Physics>Electricity and Magnetism>Magnetism and Matter>Magnetic Properties of Materials

A paramagnetic sample shows a net magnetization of

8 {Am}^{- 1}

when placed in an external magnetic field of

0.6 T

at a temperature of

4 K

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

0.2 T

at a temperature of

16 K

. The magnetization will be

MEDIUM

Physics>Electricity and Magnetism>Magnetism and Matter>Magnetic Properties of Materials

Hysteresis loops for two magnetic materials

A

and

B

are given below:
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These materials are used to make magnets for electric generators, transformer core and electromagnet core. Then it is proper to use:

MEDIUM

Physics>Electricity and Magnetism>Magnetism and Matter>Magnetic Properties of Materials

The coercivity of a small magnet, where the ferromagnet gets demagnetised is

3 \times 10^{3} A / m

. The current required to be passed in a solenoid of length

10 cm

and number of turns

100

, so that the magnet gets demagnetised when inside the solenoid is

EASY

Physics>Electricity and Magnetism>Magnetism and Matter>Magnetic Properties of Materials

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

Distinguish between diamagnetic and paramagnetic substances.

Important Questions on Magnetism and Matter

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