Assertion: Diamagnetic materials can exhibit magnetism.
Reason: Diamagnetic materials have permanent magnetic dipole moment.

Options

A. If both the assertion and reason are true and reason is a true explanation of the assertion.
B. If both the assertion and reason are true but the reason is not the correct explanation of assertion.
C. If the assertion is true is true but reason is false.
D. If both the assertion and reason are false.

Answer

C

Explanation

Some materials when placed in an external magnetic field, acquire a very low magnetism in a direction opposote to the field. These materials when brought near the end of a strong magnet, they get repelled. These materials are diamagnetic and this property of materials is called the diamagnetism. This property is generally found in materials in which there are even number of electrons in their atoms (or molecules) and pairs are formed with two electrons. In each pair, the spin of one electron is in direction opposite to the spin of otherelectron. Hence, the electrons of each pair completely cancel the magnetic moment of each other.
Thus, the net magnetic moment of each atom of such material is zero.