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A long wire is first bent into a circula...

A long wire is first bent into a circular coil of one turn and then into a circular coil of smaller radius, having n identical turns. If the same current passes in both the cases, find the ratio of the magnetric fields produced at the centre in the two cases.

A

one quarter of tis value in first case

B

one half of its value in the first case

C

two times its value in first case

D

four times is value in first case.

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