Changing magnetic flux makes emf.
Faraday's law and magnetic flux, the direction of induced currents and Lenz's law, motional emf and the energy balance of a moving conductor, the induced electric field, eddy currents and electromagnetic damping, self-inductance and the inductance of a solenoid, growth and decay of current in LR circuits, energy stored in an inductor and magnetic energy density, mutual inductance, and the induction coil.