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The mutual inductance between two planar concentric rings of radii $r_{1} a n d r_{2}$ (with $r_{1} > r_{2}$ ) placed in air is given by

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μ0πr222r1

μ0πr122r2

μ0π(r1+r2)22r1

μ0π(r1+r2)22r2

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detailed solution

Correct option is A

μ0i2r1×πr22=MiM=μ0r22π2r1

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

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The mutual inductance between two planar concentric rings of radii $r_{1} a n d r_{2}$ (with $r_{1} > r_{2}$ ) placed in air is given by