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When a certain length of wire is turned into one circular loop, the magnetic induction at the centre of coil due to some current flowing is B₁ . If the same wire is turned into three loops to make a circular coil, the magnetic induction at the centre of this coil for the same current will be

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B₁

3B₁

27B₁

9B₁

answer is B.

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Detailed Solution

When wire is turned into n circular loops, then magnetic induction is
$B^{'} = n^{2} B = (3)^{2} B_{1} = 9 B_{1}$

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