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A wire of length l is used to form a coil. The magnetic field at its center for a given current in it is minimum if the coil has

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data is not sufficient

4 turns

1 turn

2 turns

answer is C.

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Detailed Solution

$B = \frac{μ_{0} n i}{2 r} \Rightarrow l = 2 π r n, r = \frac{l}{2 π n} So, B = \frac{μ_{0} π i n^{2}}{l} \Rightarrow B is minimum if n = 1$

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