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Magnetic induction at the point O in the...

Magnetic induction at the point O in the adjacent figure is

A

`(mu_(0) i)/(8) ((3)/(a) + (1)/(b))`

B

`(mu_(0)i)/(4) ((3)/(a) + (1)/(b))`

C

` (mu_(0) i)/(8 pi) ((3)/(a) + (1)/(b))`

D

none of these

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The correct Answer is:
A
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