A) \[M\propto \sqrt{{{L}_{1}}{{L}_{2}}}\]
B) \[M\propto \sqrt{\left( \frac{{{L}_{1}}}{{{L}_{2}}} \right)}\]
C) \[M\propto \sqrt{\left( \frac{{{L}_{2}}}{{{L}_{1}}} \right)}\]
D) none of these
Correct Answer: A
Solution :
The coefficient of mutual induction is \[M\propto \sqrt{{{L}_{1}}{{L}_{2}}}\]
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