4-pole , 500 volts shunt motor has a simplex lap winding placed in 80 solts , each cotain 30 conductors . The shunt filed resistance and the armature resistance are 250 and 0.005 ohm respectively . the flux per pole is 0.001 webers . The torque developed is 20 Nm when the motor current is 52 amp . Determine : 1- the number of armature conductors 2- the motor speed