A 6-pole, 250 V wave connected shunt motor running at 955 rpm has 1200 armature conductors and useful flux/pole of 10m Wb. The armature and field resistance are 0.5 Ω and 250 Ω, respectively. If the motor draws 20 A from the supply mains, then the value of torque developed by the motor is ______.
1
65.8 N-m
2
45.6 N-m
3
57.9 N-m
4
62.3 N-m