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Magnetism and Matter · Question 25

AIPMT 2009MCQEasy📈 Topic in 25% papers+4−1
1

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

Answer

(4) repelled by both the poles

Solution

As per NCERT, a diamagnetic substance develops a weak magnetisation opposite to the applied field, so it tends to move from the stronger to the weaker part of the field.

Near either pole the field is strongest at the pole, so the substance is pushed away.

It is repelled by both the poles.

Answer: (4)

AIPMT 2009

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2

A bar magnet having a magnetic moment of 2 104 J T-1 is free to rotate in a horizontal plane. A horizontal magnetic field B = 6 10-4 T exists in the space. The work done in taking the magnet slowly from a direction parallel to the field to a direction 60 from the field is

  1. 12 J
  2. 6 J
  3. 2 J
  4. 0.6 J
AIPMT 2009
3

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
AIPMT 2008
4

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
AIPMT 2007
5

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
AIPMT 2006
6

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
AIPMT 2005
7

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
AIPMT 2003
8

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
AIPMT 2003
9

A bar magnet is oscillating in the Earth's magnetic field with a period T. What happens to its period and motion if its mass is quadrupled?

  1. motion remains simple harmonic with time period = T2
  2. motion remains S.H.M. with time period = 2T
  3. motion remains S.H.M. with time period = 4T
  4. motion remains S.H.M. and period remains nearly constant
AIPMT 2003
10

Two bar magnets having same geometry with magnetic moments M and 2M, are firstly placed in such a way that their similar poles are same side then its time period of oscillation is T1. Now the polarity of one of the magnets is reversed then time period of oscillation is T2, then

  1. T1 < T2
  2. T1 = T2
  3. T1 > T2
  4. T2 =
AIPMT 2002
11

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

  1. diamagnetism
  2. paramagnetism
  3. ferromagnetism
  4. ferrite
AIPMT 2001

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