First slide
Magnetic flux and induced emf
Question

A coil of area 80 square cm and 50 turns is rotating with 2000 revolutions per minute about an axis perpendicular to a magnetic field of 0.05 Tesla. The maximum value of the e.m.f. developed in it is

Moderate
Solution

e=NBAω;ω=2πf=2π×200060e=50×0.05×80×104×2π×200060=4π3

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