Physics – 4.5.2 The a.c. generator | e-Consult

a) The e.m.f. produced by the generator is directly proportional to the speed of rotation of the coil. A faster rotation speed means the coil sweeps a larger area of the magnetic field in the same amount of time, resulting in a larger induced e.m.f. The e.m.f. is proportional to the rate of change of magnetic flux through the coil.

b) If the magnetic field strength were increased, the magnitude of the induced e.m.f. would increase. This is because a stronger magnetic field results in a greater magnetic flux through the coil for a given area, leading to a larger induced e.m.f.

c) The e.m.f. at the peak of the waveform is V_peak. The e.m.f. at the trough of the waveform is -V_peak. The peak value represents the maximum positive e.m.f. and the trough value represents the maximum negative e.m.f. The peak and trough values are related to the average e.m.f. by the following equation: V_peak = 2 * Average e.m.f. The average e.m.f. is zero for a full cycle.