Finding motor line current and induced e.m.f?

1. Feb 26, 2013

RegardedBody

1. A 400 V, 10 HP, 3-phase synchronous motor has negligible armature resistance and a synchronous reactance of 10 Ω/phase. The motor runs at unity power factor. Determine the motor line current and the corresponding induced e.m.f for full-load conditions. The efficiency of the motor is 85%

2. P=$\sqrt{3}$ VI

EGP (unity) = $\sqrt{ (V+IR)^2 + (IX)^2}$

3. I tried isolating for current using the first formula then used that value in the second formula but got the wrong answer.