The magneticl induction at the point O, ...

The magneticl induction at the point O, if the wire carries a current I, is

`(mu_(0)i)/(2R)`

`(mu_(0)i)/(2piR)`

`(mu_(0)i(pi^(2)+4)^(1//2))/(4piR)`

`(mu_(0)i(pi^(2)+4))/(4piR)`

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