A coil of $n$ turns is wound tightly 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 center is

Question

$\frac{\mu_0 n I}{2(b - a)}$

$\frac{2\mu_0 n I}{b}$

$\frac{\mu_0 n I}{2(b - a)} \ln \frac{b}{a}$

$\frac{\mu_0 n I}{(b - a)} \ln \frac{a}{b}$

Solution

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