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_(0)NI)/b`

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

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

`(mu_(0)I^(N))/(2(b-a)) In b/a`

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