A coil having N turns is would tightly i...

A coil having `N` turns is would tightly in the form of a spiral with inner and outer radii a and `b` respectively. When a current `I` passes through the coil, the magnetic field at the centre is.

`(mu_0NI)/b`

`(2mu_0NI)/a`

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

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

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