I thought people helped on this forum? If anything is unclear just ask, I'm checking for posts every minute. Come on people I have to get this done by 5 pm. I've gotten a little further. I believe it has something to do with mutual inductance. A metal ring (no current) is brought close to a solonoid (coil with n turns), the solonoid has an alternating current running through it; explain using equations why the ring is repelled. (the ring is directly above the axis of the solonoid). I think the di/dt of the coil induces an emf in the ring that follows Lenz's Induction Law and in turn creates a magnetic field with polarities facing each other, so they repel. I need this in equation form though. (Is my reasoning even correct?)... Please help.