A device that uses magnetic fields to produce motion is a ______.

• A. Transformer
• B. Generator
• C. Motor
• D. Inductor

Answer: (C)

The main idea is that this device converts electrical energy into mechanical motion using magnetic fields. In a motor, electrical current flows through windings to create magnetic fields. These fields interact with the magnetic field of permanent magnets or other magnets in the device, producing a force that acts on the rotor and causes rotation or linear movement. This is the mechanism by which electrical energy becomes kinetic energy.

Transformers use changing magnetic fields to transfer energy between circuits and don’t produce motion. A generator does the reverse of a motor: it turns mechanical energy into electrical energy. An inductor stores energy in a magnetic field and influences current, but it doesn’t generate motion.