A conducting bar moves as shown near a long wire carrying a constant 80-A current. If a = 1.0 mm, b = 20 mm, and v = 5.0 m/s, what is the potential difference, Va − Vb?

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.

probably not if net force is zero

the answer is a. hope this .