Question

changing the current changes the ____ of an electromagnet.
o direction.
o charge.
o strength.
o strength and direction

Explanation:

The strength of an electromagnet is directly related to the amount of current flowing through it. Increasing or decreasing the current will increase or decrease the magnetic - field strength respectively. The direction of the magnetic field of an electromagnet is determined by the direction of the current, but the question only asks about what changes with current magnitude. Charge is not related to the effect of changing current on an electromagnet in this context.

Answer:

C. strength