A point P lies on the axis of a flat coi...

A point P lies on the axis of a flat coil carryinga current. The mangetc moment of the coil is `mu`. What will be the magnetic field at point P ? It is given that the distance of P from the centre of coil is d, which is large compared to the radius of the coil.

`(mu_(0))/( 2pi ) ((mu)/(d^(3)))`

`(mu_(0))/( 4pi ) ((mu)/(d^(3)))`

`(mu_(0))/( 6pi ) ((mu)/(d^(2)))`

`(mu_(0))/( 8pi ) ((mu)/(d^(2)))`

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