What is the principle reason why, when a small electric motor is first started up, the current through the armature is large for a moment and then settles to a much smaller value?   a. the voltage applied to the armature is higher at first b. the temperature of the armature increases at first, thus increasing the resistance of the armature c. as the motor speeds up, it generates a higher EMF in the opposite direction to the applied voltage d. the counter EMF is higher at first

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