How could a lightbulb near an electromagnet, but not touching it, be lit? Is ac or dc required? Defend your answer.

If the light bulb is connected to a wire loop that intercepts changing magnetic field lines from an electromagnet, voltage will be induced which can illuminate the bulb. Change is key, so to stay lit the electromagnet should be powered with AC.

Explanation:

distance = 150m

displ = root (50 ^2 + 100^2)

root(2500+10000)

root 125000