2. Cause and Effect Suppose that an electric
current flows in a straight wire. The current
changes so that it flows in the opposite
direction. What changes occur in the magnetic
field, and what stays the same?

before we can answer, we have to see the choices that are printed there with the question.   that's the only way we can point you to the correct one.

do you have a formula possibly

answeralert drivers who drift off the road;