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A long insulated copper wire is closely ...

A long insulated copper wire is closely wouind as a spiral of 'N' turns . Thw 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 magnetic field at the centre of the spiral is

A

`(mu_(0)NI)/(2(b-a))In((b)/(a))`

B

`(mu_(0)NI)/(2(b-a))In((b+a)/(b-a))`

C

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

D

`(mu_(0)NI)/(2b)In((b+a)/(b-a))`

Text Solution

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The correct Answer is:
A
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