Two bars of soft iron exactly alike are given. One of them is a magnet. Without using any thing more, how would you find which is a magnet. ?

By bringing the two bars near and noting which one is attracting. The attracting one is a magnet

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By bringing the two bars near and noting which one is repelling. One which repells is an ordinary iron.

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By rubbing one bar with the other and noting which becomes magnet. The bar which is magnetised is an ordinary iron

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One bar is placed flat horizontal on the table and the other bar is held vertical with its one end on the middle of first bar. If there is attraction between the two, the vertical bar is magnet otherwise ordinary iron.

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Solution

The correct option is D One bar is placed flat horizontal on the table and the other bar is held vertical with its one end on the middle of first bar. If there is attraction between the two, the vertical bar is magnet otherwise ordinary iron.
The ends of a magnet have magnetic effect while the middle part of the magnet has no magnetic effect.

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