1. Which statement about the force of an electromagnet's magnetic field is correct?
A. Increasing the number of coils increases the force, and increasing the amount of charge decreases the
force.
B. Increasing the speed of the charge increases the force, and increasing the length of the wire decreases the
force.
C. Increasing the amount of charge and decreasing the speed of the charge both increase the force.
D. Increasing the amount of charge and increasing the length of the wire