Rankers Physics

Magnetic Field Due to Circular Current Carrying Wire: Practice Problem & Solution

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 its centre is :
\[\frac{\mu_{0}NI}{b}\]
\[\frac{2\mu_{0}NI}{a}\]
\[\frac{\mu_{0}NI}{2\left( b-a \right)}log\frac{b}{a}\]
\[\frac{\mu_{0}NI}{\left( b-a \right)}log\frac{b}{a}\]

No solution provided for this question.

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