Q.

The mutual inductance between two coplanar concentric rings of radii r1 and r2(with   r1>r2 ) placed in air is given by 

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a

μ0π r122r2

b

μ0π r1+r222 r2

c

μ0 π r222r1

d

μ0πr1+r222r1

answer is A.

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Detailed Solution

μ0i2r1xπ r22 =ϕ = Mi M=μ02r1xπ r22 

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