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A long straight wire of radius a carries...

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 magntic fields B and B' at radii distance `(a)/(2) and 2a` respectively, from the axis of the wire is

A

`1//4`

B

`1//2`

C

1

D

4

Text Solution

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The correct Answer is:
C
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