Question

An armature coil consists of 30 turns of wire, each of area A= 0.05 m2 and
total resistance of 10 22. It rotates in a magnetic field of 0.15T at an angular speed of 84 radian per second. Determine the value of maximum induced emf produced in the coil. A. IV
B. 500V C. 63V
D. 43V

Answer 1

The maximum induced EMF (electromotive force) of a coil rotating in a magnetic field is

$$E_\text{max}=\omega NBA=84·30·0.15·0.05=18.9\text{ V}.$$