Find B - field at the centre of a spiral of N - Turns carrying a current i and having inner and outer radii a and b respectively.

\frac{μ_{0} N i}{2 (b - a)}

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\frac{μ_{0} N i}{b - a}

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\frac{μ_{0} N i}{2 (b - a)} l n (\frac{b}{a})

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\frac{μ_{0} N i}{2 b}

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Solution

The correct option is C $\frac{μ_{0} N i}{2 (b - a)} l n (\frac{b}{a})$

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Find B - field at the centre of a spiral of N - Turns carrying a current i and having inner and outer radii a and b respectively.

The correct option is C μ0Ni2(b−a)ln(ba)

The correct option is C $\frac{μ_{0} N i}{2 (b - a)} l n (\frac{b}{a})$