Question Detail
Question
In a DC motor, the relationship between applied voltage (V), back emf (ε_b), current (I), and resistance (R) is:
Correct Answer
Option B is the correct answer.
Detailed Explanation
The net voltage across the motor is the applied voltage minus the back emf, and that equals I × R (Ohm's law for the armature resistance). So V - ε_b = IR.
Hint
Applied minus back emf equals IR.