Final answer:
Loudspeakers, compasses, and alarms operate on the principle of magnetism.
Explanation:
Loudspeakers, compasses, and alarms all operate on the principle of magnetism. In loudspeakers, a magnet interacts with an electric current to produce sound. Compasses use a magnetized needle aligning with Earth's magnetic field to show direction. Alarms often have components that rely on magnetic properties for functionality.
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