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Find the magnetic field induction at a p...

Find the magnetic field induction at a point on the axis of a circular coil carrying current and hence find the magnetic field at the centre of circular coil carrying current.

A

`mu_(0)/2`

B

`mu_(0)i/10sqrt(5)a`

C

`mu_(0)i/4a`

D

`mu_(0)i`

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4
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