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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 condition is correct

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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 is B.

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Detailed Solution

e∝dϕdt; if ϕ→ maximum then e→ minimum.
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