1. The problem statement, all variables and given/known data Two wires are laid side by side and carry equal currents in opposite directions. Explain why the total magnetic flux density due to the current in the wires is negligible 2. The attempt at a solution I know that having a different direction for the current results in opposable magnetic fields. What I dont understand is how does opposable magnetic fields results in their cancellation. The magnetic field due to both wires in between them will always be in the same direction. So how do the magnetic fields cancel out?