1. The problem statement, all variables and given/known data Two parallel wires connected to equal sinusoidal alternating currents with a phase difference of pi rad. How does the force of attraction vary with time (draw a graph)? Q from here: https://isaacphysics.org/questions/parallel_plates?board=70437f0a-1ec0-46f4-b3d5-9b6de05311dd 2. Relevant equations F = bqvsintheta F = Bilsintheta 3. The attempt at a solution I drew the wires with currents going in opposite directions due to the ACs being exactly out-of-phase. My thought is that with the right-hand grip rule, the magnetic field lines point in opposite directions and thus cancel out resulting in no force of attraction at any point but that's wrong.