1. The problem statement, all variables and given/known data 2. Relevant equations Φ = M*I Biot-Savart law Ampere's law 3. The attempt at a solution I have the formula Φ = M*I, which means that to find the mutual inductance I simply need to find the magnetic flux through the top circuit due to the current in the bottom circuit. However, I don't yet have a solid grasp of Ampere's law. Is there a way to use Ampere's law in this situation, or am I going to have to grind it out with Biot-Savart?