AC Generator
An AC generator produces electrical energy from mechanical work, just the opposite of what a motor does. In it, a shaft is rotated by some mechanical means, such as an engine or a turbine starts working and an emf is induced in the coil.
It is based on the phenomenon of electromagnetic induction which states that whenever magnetic flux linked with a conductor (or coil) changes, an emf is induced in the coil.
The change of flux is greatest at `theta` is equal to (take,`phi_B= NBAcos omegat`)
Options:
(a) `90°,270°`
(b) `90°,45°`
(c) `60°,90°`
(d) `180°,90^o`