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A circular coil has one turn and carries...

A circular coil has one turn and carries a current I. The same wire is wound into a smaller coil of 4 turns and the same current is passed through it. The field at the centre :

A

Decreases to 1/4 th the value

B

Increase to 16 times the value

C

Increase to 4 times the value

D

Remains the same

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The correct Answer is:
B
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