Q 1536845772.     If a current `I` is flowing in a loop of radius `r`

as shown in adjoining figure, then the

magnetic field induction ate the centre `O`

will be

VIT 2013
A

Zero

B

`(mu_(0)//theta)/(4 pir)`

C

`(mu_(0)//sin theta)/(4 pir)`

D

`(2mu_(0)//sin theta)/(4 pir^(2))`

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