Practice portal › Electromagnetic Induction › AC Generator
Asked in GSEB Board July 2018; GSEB Board March 2019 · Peak and instantaneous EMF
Given: the emf is zero at t=0, so V=Vₘ sin ω t.
Idea: the emf follows the sine of the angle ω t through which the coil has turned.
At t=π/ω: ω t=π.
V=Vₘ sin π=0.
Physically, after half a turn the plane of the coil is again perpendicular to the field: the flux is at its extreme and, for that instant, not changing.
So the induced emf is zero.
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