Correct option is B
Starting Resistance in DC Motors:
· When a DC motor starts, the armature resistance is very low, typically in the range of a few ohms or less. This low resistance can result in a very high starting current if no external resistance is added.
· DC motor consists of two types of winding resistance i.e. armature winding and field winding.
· The resistance of armature winding is low.
· The resistance of field winding is high.
· At the time of starting of DC motor, starting resistance is only the resistance of armature.
· The armature resistance of a motor is very small generally less than 1Ω.
· Therefore, we use a starter to start a DC motor otherwise the starting current will be too high which may burn the motor.
