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Magnetic field at the centre of a circular coil of radius R due to curent i flowing through it is B. The magnetic field at a point along the axis at distance R from the centre is :

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Answer Text

`B/2``B/4``B/(sqrt(8))``sqrt(8)B`

Answer :
C
Solution :
`B=(mu_(0)i)/(2R), B'=(mu_(0)iR^(2))/(2(R^(2)+R^(2))^(3//2))=B/(sqrt(8))`

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