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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)/(4)`

B

`(1)/(2)`

C

1

D

4

Text Solution

Verified by Experts

The correct Answer is:
C
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