Question

Andreas has to make an electromagnet in his science class. He was only given a nail, copper wire, and a 9-volt battery. The assignment was to make a magnet strong enough to pick up paper clips. His teacher decided to make the assignment into a competition to see whose magnet could pick up the most clips.
What can Andreas do to his magnet to make sure he wins by picking up the most paper clips?
A
Andreas can wrap few coils of the wire, far apart, around the nail.

B
Andreas can wrap many coils of the wire, far apart, around the nail.

C
Andreas can wrap many coils of the wire, close together, around the nail.

D
Andreas can wrap few coils of the wire, close together, around the nail.

Answer 1

Answer:

C. Andreas can wrap many coils of the wire, close together, around the nail.

Explanation:

The ideal in this case is for Andreas to wrap the entire nail with the wire. For that he will need to use many coils of the thread. These coils should be close together, touching each other, but without overlapping, they should be next to each other. That way, Andreas's experiment will work.

If he wants to increase the magnetism power of his electromagnet, he must replace the battery with a higher voltage one.