Two magnetic needles, which can rotate in a vertical plane, are placed on either side of a straight current carrying conductor placed horizontally. Then select the correct behavior of the needles.

The two magnetic needles point upwards

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The two magnetic needles point downwards

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One magnetic needle points upwards and other points downwards

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Two magnetic needles point towards the wire.

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Solution

The correct option is C One magnetic needle points upwards and other points downwards
Using Curl finger rule. the magnetic field lines are concentric circle with wire axis as centre thus one magnetic compass directs in either upward or downwards and other on the other side.

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