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  4. The coil of dynamo is rotating in a magnetic field. The developed induced e.m.f. changes and the number of magnetic lines of force also changes. Which of the following conditions is correct?

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Q. The coil of dynamo is rotating in a magnetic field. The developed induced e.m.f. changes and the number of magnetic lines of force also changes. Which of the following conditions is correct?

Electromagnetic Induction

Solution:

$e \propto \frac{d \phi}{d t} ;$ if $\phi \rightarrow$ maximum, then $e \rightarrow$ minimum.