Question

A long straight wire of radius a carries a steady current I. The current is uniformly distributed over its cross-section. The ratio of the magnetic fields B and B', at radial distances a/2 and 2a respectively, from the axis of the wire is:(a) 1/4(b) 1/2(c) 1(d) 4

Answer 1

HERE IS YOUR ANSWER :-

Option no B

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