1.

Mark out the correct options.

Answer»

Diamagnetism occurs an all materials.
Diamagnetism result from the partial alignment of permanent magnetic moment.
The magnetising FIELD intensity H is always zero in free space.
The magnetic field of induced magnetic moment is opposite to the applied field.

Solution :When a material is placed in magnetic field, dipole moments are induced in the atoms by the applied magnetic field. Since the direction of magnetic field due to induced dipole moment is opposite to the applied magnetic field. Therefore, resultant magnetic field is smaller than the applied magnetic field. This process is called diamagnetism. As this process takes place for all the material, therefore all the material EXHIBIT diamagnetism. Hence, option (a) and (d) are CORRECT.
Diamagnetic material do not have permanent magnetic moment on their own. When they are placed in magnetic field, dipole moments are induced by the applied magnetic field. THUS, there is no net alignment of permanent magnetic moment so these materials do not have any permanent magnetic moment of their own. Hence, option (b) is incorrect.
Magnetic field intensity is not vero in free space. Hence, option (c) is incorrect.


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