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 field B and B’ at radial distances a/2 and 2a respectively, from the axis of the wire is

Options

(a) (1/2)
(b) 1
(c) 4
(d) (1/4)

Correct Answer:

1

Explanation:

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