Ncert Exercises & Solutions

In a permanent magnet at room temperature,

1. the magnetic moment of each molecule is zero.
2. the individual molecules have a non-zero magnetic moment which is all perfectly aligned.
3. domains are partially aligned.
4. domains are all perfectly aligned.

(d) Hint: The individual dipoles form domains in a bar magnet.

As we know a permanent magnet is a substance which at room temperature retains the ferromagnetic property for a long period of time.

The individual atoms in a ferromagnetic material possess a dipole moment as in a paramagnetic material.

However, they interact with one another in such a way that they spontaneously align themselves in a common direction over a macroscopic volume called domain. So we can say that in a permanent magnet at room temperature, domains are all perfectly aligned.

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