Which of the following are properties of a bar magnet that distinguishes it from an ordinary iron bar?

It points towards north-south when freely suspended.

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It always gets attracted towards other magnets.

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It gets repelled from similar poles of other magnets.

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It has two distinct permanent magnetic poles.

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Solution

The correct options are
A It points towards north-south when freely suspended.
C It gets repelled from similar poles of other magnets.
D It has two distinct permanent magnetic poles.
Suspend the iron bar and the bar magnet freely. The one which aligns itself towards the North-South direction is a magnet,
Also, only a magnet can repel other magnets. If it is an ordinary iron bar, it would always get attracted towards magnets. But repulsion is the true test of magnetism. In addition to this only bar magnets have permanent distinct poles.

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(a) When two pins are hung by their heads from the same pole of a magnet, their pointed ends move apart.

(b) Several soft iron pins can cling, one below the other, from the pole of a magnet.

(c) The north end of a freely suspended magnetic needle gets attracted towards a piece of soft iron placed a little distance away from the needle.

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