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A long staright wire of radius a carries...

A long staright wire of radius a carries a steady current I the current is uniformally distributed over its cross section the ratio of the magnetic field B and B' at radical distance a/2 and 2a respectively from the axis of the wire is

A

1

B

4

C

(1/4)

D

(1/2)

Text Solution

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The correct Answer is:
A
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