Question

which devices might use electromagnets? check all that apply. audio speakers plastic combs trains doorbells revolving chairs cranes

Explanation:

• Audio speakers: Use electromagnets to convert electrical signals to sound by moving the speaker cone.
• Plastic combs: Relate to static electricity, not electromagnets.
• Trains (like maglev trains): Use electromagnets for propulsion/levitation.
• Doorbells: Often use electromagnets to strike the bell.
• Revolving chairs: Mechanically operated, no electromagnets.
• Cranes (electromagnetic cranes): Use electromagnets to lift metal objects.

Answer:

A. audio speakers, C. trains, D. doorbells, F. cranes