Question

choose all the ways to increase the strength of an electromagnet. increase the power of the battery increase the number of coils move the coils closed together turn the electromagnet off

Explanation:

Increasing battery power boosts current, enhancing magnetic field. More coils increase magnetic - field strength. Moving coils closer concentrates the field. Turning it off makes it non - existent and thus doesn't increase strength.

Answer:

Increase the power of the battery, Increase the number of coils, Move the coils close together