A 3 phase, 4 pole, 400 V, 10 kW slip ring induction motor has rotor resistance = 0.16 Ω per phase and stator resistor of 0.27 Ω per phase. The voltage across the slip rings at standstill is 141 V per phase. The motor develops a torque of 62.4 Nm at a slip of 0.08 and the rotor current is 6 A. What is the rotor current if a voltage is injected to the rotor so that the motor runs of slip s = 0.02 and develops same torque?

• A. 6 A
• B. 5 A
• C. 4 A
• D. 3 A