(a) Describe the effect of running an induction motor on reduced voltage (6)

(b) A 90V d.c. generator is used to charge a battery of 40 cells in series, each cell having an average e.m.f. of 1.9 V and an internal resistance of 0,0025 Ω. If the total resistance of the connecting cells is 1Ω, calculate the value of the charging current (10)