1. The problem statement, all variables and given/known data Why does a magnet move slowly in a copper tube, but doesn't in a nonmetal tube? 2. Relevant equations Electromagnetic induction (Faraday’s principle) is the production of voltage across a conductor situated in a changing magnetic field or a conductor moving through a stationary magnetic field Lenz’s Law states that an electromagnetic field interacting with a conductor will generate electrical current that induces a counter magnetic field that opposes the magnetic field generating the current An eddy current is a swirling current set up in a conductor in response to a changing magnetic field. By Lenz's law, the current swirls in such a way as to create a magnetic field opposing the change; to do this in a conductor, electrons swirl in a plane perpendicular to the magnetic field 3. The attempt at a solution I found out that there are two forces repelling each other as the magnet pass the copper tube, but why wouldn't the nonmetal tube create a magnetic force? Is it because nonmetals are bad conductors of electricity? Thanks for the help.