1. The problem statement, all variables and given/known data A small bar magnet is being slowly inserted with constant velocity inside a solenoid as shown in figure. Which graph best represents the relationship between emf induced with time 2. Relevant equations ε = -dφ/dt φ = B.A 3. The attempt at a solution Since the magnet is brought closer to the solenoid at a constant speed, the emf should be constant, then it should fall to zero inside the solenoid and finally an emf in the opposite direction should be generated. The closest answer to my reasoning is (C), which is indeed the correct answer. However, I don't understand why (C) is sort of a sine wave. I thought it would be more of a constant function.