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A current I flows along a thin wire shap...

A current I flows along a thin wire shaped as shown in figure. The radius of the curved part of the wire is r. The field at the centre O of the coil is:

A

`(mu_(0))/(4). (i)/(r )`

B

`(mu_(0))/(2 pi r)`

C

`(mu_(0) I)/(2 pi r)`

D

`(mu_(0) I)/(8 pi r) (3 pi + 4)`

Text Solution

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The correct Answer is:
D
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