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Q.

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

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a

decreases to 1/4 of the value

b

remains the same

c

increases to 14 times the value

d

increases to 16 times the value

answer is D.

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Detailed Solution

B∝(n/r)Here number of turns becomes 4 times while the radius becomes (1/4) times. Hence B becomes 16 times
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