Q. 3

In a permanent magnet at room temperature
A. magnetic moment of each molecule is zero.

B. the individual molecules have non-zero magnetic moment which are all perfectly aligned.

C. domains are partially aligned.

D. domains are all perfectly aligned

Answer :

In a room temperature, a permanent magnet acts as a ferromagnetic material whose domains are aligned in the same direction. Domain is an aspect of ferromagnetic materials in which the electrons have same magnetic orientation. After keeping the permanent magnet in a room temperature for a long time individual atoms align themselves in same direction and due to same magnetic orientation, it forms a dipole, which has a working north and south pole. Some examples of room temperature, ferromagnetic material that can change to permanent magnet are iron, nickel, cobalt and gadolinium.

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