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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 magnetic fields B and B' at radial distances `q/2` and `2 a` respectively, from the axis of the wire is

A

`(1)/(2)`

B

1

C

4

D

`(1)/(4)`

Text Solution

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The correct Answer is:
b
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