Concept:Devices that use magnetic effects, such as attraction, repulsion, or electromagnets, operate on magnetism.
Explanation:Loudspeakers use an electromagnet interacting with a permanent magnet to produce sound.
Compasses rely on a magnetic needle aligning with the Earth’s magnetic field.
Alarms commonly use magnetic switches or electromagnets to produce alerts.
LCD TV works on liquid crystal display technology, not magnetism.
Answer:A. Loudspeakers, compass, alarms