Please answer the question fully:

Question 4: (10 points) The torque produced by the motor in Question 3 is reduced by 50%. The motor is assumed to be well-designed (flux is directly proportional to the current). Under this condition, calculate the following: a) Armature current (4 points) b) Motor speed (3 points) c) Efficiency ( 3 points) (Hint: Refer to lecture notes for March 8, 2023)