Question

Maria makes an electromagnet shown in the figure below. The battery has a voltage of 6.0V, and she uses an iron nail. Which of the following would increase the strength of the magnetic field produced?



a
Replacing the iron nail with one made of plastic.
b
Reversing the direction of the current flow.
c
Doubling the number of times the wire wraps around the nail.
d
Changing the battery to a 3.0V battery.

Answer 1

c) Doubling the number of times the wire wraps around the nail. This will increase the number of coils of wire, which increases the strength of the magnetic field produced by the electromagnet.