A) \[{{R}_{1}}/{{R}_{2}}\]
B) \[{{R}_{2}}/{{R}_{1}}\]
C) \[R_{1}^{2}/{{R}_{2}}\]
D) \[R_{2}^{2}/{{R}_{1}}\]
Correct Answer: D
Solution :
Mutual inductance between two coil in the same plane with their centers coinciding is given by \[M=\frac{{{\mu }_{0}}}{4\pi }\left( \frac{2{{\pi }^{2}}R_{2}^{2}{{N}_{1}}{{N}_{2}}}{{{R}_{1}}} \right)\] henry.
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