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A long staright wire of radius a carrie...

A long staright wire of radius `a` carries a steady current `I`. The curent is unifromly 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

`1/2`

B

`1`

C

`4`

D

`1/4`

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The correct Answer is:
b
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