Question

In an AC generator, a coil with N turns all of the same area A and total resistance R, rotates with frequency ω in a magnetic field B. The maximum value of emf generated in the coil will be ______.

Options

• NABRω

• NAB

• NABR

• NABω

Answer 1

In an AC generator, a coil with N turns all of the same area A and total resistance R, rotates with frequency ω in a magnetic field B. The maximum value of emf generated in the coil will be NABω.

Explanation:

In an AC generator, the emf generated is maximum when the flux is maximum. It is possible if the angle between the area vector of the coil and the magnetic field is 0°. In such a case, the emf generated is e = NBAω cos ωt. On neglecting cos ωt, the maximum value of the emf generated in the coil is e = NBA ω.