(b) A wave wound, 6-pole shunt DC generator has 600 armature conductors. The generator is driven at 300 rpm. Calculate the emf generated if the flux per pole is 0.060 Wb. If now the generator is required to produce an emf of 550 V at a reduced value of flux per pole of 0.055 Wb. Calculate the speed at which the armature of the generator must be driven.