Electro Magnetic Induction And Alternating Currents Question 501

Question: A motor having an armature of resistance $ 2\Omega $ . Is designed to operate at 220 V mains. At full speed, it develops a back emf of 210V. When the motor is running at full speed, the current in the armature is:

Options:

A) 3 A

B) 5 A

C) 7A

D) 10A

Show Answer

Answer:

Correct Answer: B

Solution:

  • $ I=\frac{e_{1}-e_{2}}{R}=\frac{220-210}{2}=5A $


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