Question

An electromagnet is created using a battery, an insulated copper wire and an iron nail. The wire is wrapped around the nail 20 times and attached to the battery. Which pair of changes will definitely increase the strength of the electromagnet?
A)
Increase the voltage of the battery and decrease the number of turns of the coil.
B)
Decrease the voltage of the battery and decrease the number of turns of the coil.
C)
Increase the voltage of the battery and increase the number of turns of the coil.
D)
Decrease the voltage of the battery and increase the number of turns of the coil.

Answer 1

@dakid88

Answer 2

I think it is D

Answer 3

Ok thanks.