1. The problem statement, all variables and given/known data You have a circuit with current I running through a solenoid. You insert a small piece of iron into the coil; what happens? 2. Relevant equations d(Magnetic Flux)/dt = -EMF 3. The attempt at a solution Iron is diamagnetic, so inserting it will decrease the magnetic field inside the inductor. Faraday's Law and Lenz's Law tell us that a changing flux induces an EMF to create a field opposing this change in flux. Therefore, my thought is that the current increases, then decreases back to its original value. Does that seem right?