Which of the following cannot happen, irrespective of whether the given iron bar B is a bar magnet or not?
(a) Both ends of B are attracted to the north pole of a magnet.
(b) Both ends of B are attracted to the south pole of a magnet.
(c) One end of B is attracted and the other end is repelled by the north pole of a magnet.
(d) Both ends of B are repelled by the south pole of a magnet.

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Solution

(d) Both ends of B are repelled by the south pole of the magnet.

If the bar B is not a magnet, then both ends of B can be attracted to the south pole and repulsion cannot take place. If B is a bar magnet, then one end of B will be repelled by the south pole, namely B's south pole. However, B's north pole will be attracted towards the south pole of the bar magnet. Again, both ends being repelled cannot happen.

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