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A long insulated copper wire is closely ...

A long insulated copper wire is closely wound as a spiral of `N` turns. The spiral has inner radius a and outer radius `b`. The spiral lies in the `xy`-plane and a steady current I flows through the wire. The`z`-component of the magetic field at the centre of the spiral is

A

`(mu_(0)NI)/(b)`

B

`(2mu_(0)NI)/(a)`

C

`(mu_(0)NI)/(2(b-a))ln.(b)/(a)`

D

`(mu_(0)IN)/(2(b-a))ln.(b)/(a)`

Text Solution

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The correct Answer is:
C
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