Question

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

Explanation:

Electromagnets are used in devices where magnetic - electric interactions are harnessed for functionality. Audio speakers convert electrical signals to sound using electromagnets. Maglev trains use electromagnets for levitation and propulsion. Doorbells use electromagnets to strike the bell. Cranes can use electromagnets to lift and move metal objects. Plastic combs and revolving chairs have no use for electromagnets.

Answer:

audio speakers, trains, doorbells, cranes