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A coil of n number of turns is wound tig...

A coil of n number of turns is wound tigtly in the form of a spiral with inner and outer radii `a` and `b` respectively. When `a` current of strength `I` is passed through the coil, the magnetic field at its centre is

A

`(mu_0nJ)/(2(b-a))log_efracba`

B

`(mu_0nJ)/((b-a))log_efracba`

C

`(mu_0nJ)/((b-a))log_efracba`

D

`(2munI)/b`.

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