Physics

Problem

Two identical coils, each of area

0.020\,\text{m}^2

, are mounted on the same shaft so that they rotate together in a uniform magnetic field of

0.50\,\text{T}

. The coils are connected in series. If the shaft rotates at

1500\,\text{rev min}^{-1}

, what is the smallest integer number of turns that each coil must have for the series combination to supply

220\,\text{V}

rms? a) 70 turns b) 50 turns c) 100 turns d) 200 turns