A bar magnet is heated strongly. Its magnetic strength

is likely to remain same

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is likely to increase

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is likely to decrease

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none of the above

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Solution

The correct option is C is likely to decrease
Heating a magnet will destroy long range ordering. In the case of heating, energy is provided to magnetic dipoles causing them to free themselves from the initial order, t

The atoms of a bar magnet can be considered as tiny magnets (having $N$ and $S$ poles) aligned in one direction.

When we heat a magnet at a high temperature, the heat energy frees the tiny magnets from their ordered orientation. This reduces or destroys the ordering of the tiny magnets. As a result, the magnet loses its magnetism, i.e. it gets demagnetised.

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