A circular coil has one turn and carries a current \( i \). The same wire is wound into a smalle...

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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 \( 1 / 4 \) of the value
(B) Is the same
(C) Increases to 14 times the value
(D) Decreases to 16 times the value
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