Magnetism and Matter

Match List I with List II Choose the correct answer from the options given below.

1. A-II, B-III, C-IV, D-I
2. A-II, B-I, C-III, D-IV
3. A-III, B-II, C-I, D-IV
4. A-IV, B-III, C-II, D-I

The incorrect relation for a diamagnetic material (all the symbols carry their usual meaning and is a small positive number) is

1. < 0
2. 0 r < 1
3. -1 < 0
4. 1 < r < 1 +

A thin diamagnetic rod is placed vertically between the poles of an electromagnet. When the current in the electromagnet is switched on, then the diamagnetic rod is pushed up, out of the horizontal magnetic field. Hence the rod gains gravitational potential energy. The work required to do this comes from

1. The current source
2. The magnetic field
3. The lattice structure of the material of the rod
4. The induced electric field due to the changing magnetic field

The magnetic susceptibility is negative for

1. ferromagnetic material only
2. paramagnetic and ferromagnetic materials
3. diamagnetic material only
4. paramagnetic material only

There are four light-weight-rod samples A, B, C, D separately suspended by threads. A bar magnet is slowly brought near each sample and the following observations are noted (i) A is feebly repelled (ii) B is feebly attracted (iii) C is strongly attracted (iv) D remains unaffected Which one of the following is true ?

1. B is of a paramagnetic material
2. C is of a diamagnetic material
3. D is of a ferromagnetic material
4. A is of a non-magnetic material

The magnetic moment of a diamagnetic atom is

1. much greater than one
2. 1
3. between zero and one
4. equal to zero

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

1. repelled by the north pole and attracted by the south pole
2. attracted by the north pole and repelled by the south pole
3. attracted by both the poles
4. repelled by both the poles

Curie temperature above which

1. paramagnetic material becomes ferromagnetic material
2. ferromagnetic material becomes diamagnetic material
3. ferromagnetic material becomes paramagnetic material
4. paramagnetic material becomes diamagnetic material

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

1. anti ferromagnetism
2. no magnetic property
3. diamagnetism
4. paramagnetism

Curie temperature is the temperature above which

1. paramagnetic material becomes ferromagnetic material
2. ferromagnetic material becomes diamagnetic material
3. ferromagnetic material becomes paramagnetic material
4. paramagnetic material becomes diamagnetic material

If the magnetic dipole moment of an atom of diamagnetic material, paramagnetic material and ferromagnetic material are denoted by d, p and f respectively, then

1. d = 0 and p 0
2. d 0 and p = 0
3. p = 0 and f 0
4. d 0 and f 0

A diamagnetic material in a magnetic field moves

1. from stronger to the weaker parts of the field
2. from weaker to the stronger parts of the field
3. perpendicular to the field
4. in none of the above directions

According to Curie's law, the magnetic susceptibility of a substance at an absolute temperature T is proportional to

1. 1/T
2. T
3. 1/T2
4. T2

Among which the magnetic susceptibility does not depend on the temperature?

1. diamagnetism
2. paramagnetism
3. ferromagnetism
4. ferrite