When one end of an iron rod is placed near a compass,

It is always the N-pole of the compass that points towards it.

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It is always the S-pole of the compass that points towards it.

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Any pole of the compass may point towards it.

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The compass needle will not be affected by iron rod.

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Solution

The correct option is B Any pole of the compass may point towards it.
The needle of a compass is a magnet. Either end of the needle can be attracted to the iron rod because iron is a magnetic material. Which end of the compass needle turns to the iron rod depends on which end of the needle is closer to the rod. Hence any pole of the compass may points towards it.

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