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A wire is tightly wound to form of a spi...

A wire is tightly wound to form of a spiral of N turns with the inner and outer radii equal to a and b respectively. When a current I is established in the coil, the magnetic field at the centre is

A

`(mu_0NI)/b`

B

`(2mu_0NI)/a`

C

`(mu_0NI)/(2(b-a))log.b/a`

D

`(mu_0IN)/(2(b-a))log.a/b`

Text Solution

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The correct Answer is:
C
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