1. The problem statement, all variables and given/known data Find the B-field between two ribbons with the current flowing in opposite directions on each. 2. Relevant equations Biot-Savart equation 3. The attempt at a solution In attempting to solve this I have found the B-field due to an infinite wire is B= (mu)I/2(pi)r Were r is the distance from the wire to the point at which B-field exists. Can someone tell me if this equation is directly applicable to the B-field from two parallel plates?