jocky

Can anyone please help with this? I've been looking at it for days now and getting nowhere! A 3-phase, four pole, 50Hz wound rotor induction motor has a rotor resistance of 0.02ohm/phase and reactance of 0.1ohm/phase at standstill. Find: i. the value of the external starter resistance/phase required to give maximum torque at starting ii. the ratio of starting current in i. to original. Could you show any working? The frustration's really getting to me!