Question

Alisha made the electromagnet shown below. She used the electromagnet to pick up some paper clips.



Alisha wants the electromagnet to be able to pick up even more paper clips. What should she change?
A.
She should use bigger paper clips.
B.
She should move the nail farther from the paper clips.
C.
She should add more loops of wire around the nail.
D.
She should move the battery to the other side of the nail.

Answer 1

C. Adding more loops of wire around the nail increases the number of turns, which increases the magnetic field (B ∝ N·I), so the electromagnet can pick up more paper clips.