The armature of a DC motor depends on a magnetic field for motion.

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Multiple Choice

The armature of a DC motor depends on a magnetic field for motion.

Explanation:
A DC motor turns because current flowing in the armature windings experiences force in a magnetic field. The magnetic field provides the environment in which the current-carrying conductors on the rotor feel a Lorentz force, and those forces combine around the shaft to produce a torque that makes the armature rotate. The field can come from permanent magnets or from electromagnets (field windings); either way, a magnetic field is required for motion. Without a magnetic field, the armature would not experience the sideways forces that generate torque, so rotation wouldn’t occur.

A DC motor turns because current flowing in the armature windings experiences force in a magnetic field. The magnetic field provides the environment in which the current-carrying conductors on the rotor feel a Lorentz force, and those forces combine around the shaft to produce a torque that makes the armature rotate. The field can come from permanent magnets or from electromagnets (field windings); either way, a magnetic field is required for motion. Without a magnetic field, the armature would not experience the sideways forces that generate torque, so rotation wouldn’t occur.

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