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As shown in the figure, a single conduct...

As shown in the figure, a single conducting wire is bent to form a loop in the from of a circle of radius 'r' concentrically inside a square of side 'a' where `a : r = 8 : pi A ` battery B drives a current through the wire. If the battery B and the gap G are of negligible sizes . determine the strength of magnetic field at the common centre O

A

`( mu_(0) I)/( 2 pi a) sqrt(2) ( sqrt(2) - 1)`

B

`( mu_(0) I)/( 2 pi a) ( sqrt(2) + 1)`

C

`( mu_(0) I)/( 2 pi a)2 sqrt(2) ( sqrt(2) + 1)`

D

`( mu_(0) I)/( 2 pi a)2 sqrt(2) ( sqrt(2) - 1)`

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