Question

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 condition is correct

• A. Lines of force minimum but induced e.m.f. is zero
• B. Lines of force maximum but induced e.m.f. is zero
• C. Lines of force maximum but induced e.m.f. is not zero
• D. Lines of force maximum but induced e.m.f. is also maximum

Answer 1

Answer: (B)

Lines of force maximum but induced e.m.f. is zero

Answer 2

$e \propto \frac{d\varphi}{dt};$ if φ → maximum then e → minimum.