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Two conducting circular loops A and B are placed in the same plane with their centres coinciding as shown in figure. The mutual inductance between them is :

1. b 2 a 2 0 π μ
2. a b 2 2 0 ⋅ π μ
3. a 2 b 2 0 π μ
4. b a 2 2 0 ⋅ π μ

Correct answer: b 2 a 2 0 π μ

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