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Question

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.

A
μ0Ni2(ba)
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B
μ0Niba
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C
μ0Ni2(ba)ln(ba)
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D
μ0Ni2b
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Solution

The correct option is C μ0Ni2(ba)ln(ba)

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