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.

If the magnetic dipole moment of an atom of diamagnetic material, paramagnetic material and ferromagnetic material area denoted by ${\mathrm{\mu }}_{\mathrm{d}}, {\mathrm{\mu }}_{\mathrm{p}} \mathrm{and} {\mathrm{\mu }}_{\mathrm{f}}$, respectively, then

1.  ${\mathrm{\mu }}_{\mathrm{p}} = 0 \mathrm{and} {\mathrm{\mu }}_{\mathrm{f}} \ne 0$

2.  ${\mathrm{\mu }}_{\mathrm{d}} \ne 0 \mathrm{and} {\mathrm{\mu }}_{\mathrm{p}} = 0$

3.  ${\mathrm{\mu }}_{\mathrm{d}} \ne 0 \mathrm{and} {\mathrm{\mu }}_{\mathrm{f}} \ne 0$

4.  ${\mathrm{\mu }}_{\mathrm{d}} = 0 \mathrm{and} {\mathrm{\mu }}_{\mathrm{p}} \ne 0$

Above Curie temperature

1.  a ferromagnetic substance becomes paramagnetic.

2.  a paramagnetic substance becomes diamagnetic.

3.  a diamagnetic substance becomes paramagnetic.

4.  a paramagnetic substance becomes ferromagnetic.

Nickel shows the 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.

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.

A bar magnet having a magnetic moment of $2\times {10}^4 {\mathrm{JT}}^{-1}$ is free to rotate in a horizontal plane. A horizontal magnetic field $\mathrm{B} = 6 \times {10}^{-4} \mathrm{T}$ exists in the space. The work  done in taking the magnet slowly from a direction parallel to the field to a direction ${60}^o$ from the field is -

1.  12J

2.  6J

3.  2J

4.  0.6J

Electromagnets are made of soft iron because soft iron has

1.  high retentivity and low coercive force.

2.  low retentivity and high coercive force.

3.  high retentivity and high coercive force.

4.  low retentivity and low coercive force.

The magnet moment of a diamagnetic atom is

1.  1

2.  between zero and one

3.  equal to zero

4.  much greater than one

A short bar magnet of magnetic moment 0.4 ${\mathrm{JT}}^{-1}$ is placed in a uniform magnetic field of 0.16 T. The magnet is in stable equilibrium when the potential energy is

1.  0.064 J

2.  -0.064 J

3.  zero

4.  0.082 J

A compass needle which is allowed to move in a horizontal plane is taken to a geomagnetic pole. It

1.  will stay in north-south direction only.

2.  will stay in east-west direction only.

3.  will become rigid showing no movement.

4.  will stay in any position.