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Which would ultimately cause the armature in an electric motor to spin?
The current in the armature stops.
The gap in the commutator closes.
The current in the armature is reversed.
The commutator loses contact with the brushes.
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GPT-5 mini
AI
"The current in the armature is reversed."
Reason: A current-carrying armature in a magnetic field experiences a torque (F = I L × B). As the coil passes the neutral position the torque would reverse and stop rotation unless the commutator reverses the armature current each half-turn. That reversal keeps the torque in the same rotational direction and thus causes continuous spinning. The other choices (current stopping, commutator losing contact, or "closing the gap" in the split commutator) would interrupt or prevent proper commutation and halt motion.
Reason: A current-carrying armature in a magnetic field experiences a torque (F = I L × B). As the coil passes the neutral position the torque would reverse and stop rotation unless the commutator reverses the armature current each half-turn. That reversal keeps the torque in the same rotational direction and thus causes continuous spinning. The other choices (current stopping, commutator losing contact, or "closing the gap" in the split commutator) would interrupt or prevent proper commutation and halt motion.
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