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Questions  

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

a
μ0 π r222r1
b
μ0π r122r2
c
μ0πr1+r222r1
d
μ0π r1+r222 r2

detailed solution

Correct option is A

μ0i2r1xπ r22 =ϕ = Mi M=μ02r1xπ r22

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