1. The problem statement, all variables and given/known data http://imgur.com/a/7CUcU What happens when you close W? What happens when you open W again at Q? If there is a ring of metal at Q, on the coil. 2. Relevant equations There is no relevant equations in this case. 3. The attempt at a solution North will be on top and south on the bottom when there is a current. The magnetic field will be poiting upwards, since thats how it works in coils. This will make the ring of metal make create an induced magnetic field according to Lenz law it will be pointing downwards and thus the top of the metal ring will be N and the bottom will be S. But what will happen, will it try to leave the coil or not? I do know South repel South etc.. But now i have difficulites saying what will happen to the metal ring.