Two conducting circular loops of radii R 1 and R 2 are placed in the same plane with their centres coinciding. If R 1 >> R 2 , the mutual inductance M between them will be directly proportional to

1. A. R 2 R 1
2. B. R 1 2 R 2
3. C. R 2 2 R 1
4. D. R 1 R 2

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