Which devices might use electromagnets? pick all that apply. 1. audio speakers 2. plastic combs 3. trains 4. doorbells 5.revolving chairs 6.cranes

1. audio speakers

3. trains

4. doorbells

6. cranes

Explanation:

Electromagnets are the magnets which can work when the electric current pass through them. The strength of electromagnet depends on the amount of current passing through it, number of turns in the coil and the nature of material of core.

Electromagnet is used in

1. audio speakers

2. trains

3. doorbells

4. cranes

Explanation:

i think it’s a. this is because if they measured the mass of something with a mass of 150g, then their final answer would have to be approximately 150g. though all of their answers are almost 150, rosa and tran have the closest answers (or the exact answer) to the accurate one.