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Magnetism and Matter · Question 26

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

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

Answer

(2) 6 J

Solution

Work done in turning a magnetic dipole from 1 to 2:

W = mB( 1 - 2)

= (2 104)(6 10-4)( 0 - 60 )

= 12 (1 - 12 )

= 6 J

Answer: (2)

AIPMT 2009

Keep practising — Magnetism and Matter

2

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
3

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
4

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
5

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
6

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
7

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
8

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
9

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
10

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

  1. diamagnetism
  2. paramagnetism
  3. ferromagnetism
  4. ferrite
AIPMT 2001
11

Tangent galvanometer is used to measure

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

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