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Magnetism and Matter · Question 29

AIPMT 2006MCQEasy📈 Topic in 25% papers+4−1
1

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

Answer

(3) ferromagnetic material becomes paramagnetic material

Solution

As per NCERT, the ferromagnetic property depends on temperature. At a high enough temperature the domain alignment is destroyed by thermal agitation and a ferromagnet becomes a paramagnet.

∴ The temperature of this transition is the Curie temperature TC; above TC a ferromagnetic material behaves as a paramagnetic material.

Answer: (3)

AIPMT 2006

Keep practising — Magnetism and Matter

2

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
3

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
4

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
5

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
6

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
7

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

  1. diamagnetism
  2. paramagnetism
  3. ferromagnetism
  4. ferrite
AIPMT 2001
8

Tangent galvanometer is used to measure

  1. potential difference
  2. current
  3. resistance
  4. charge
AIPMT 2001

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