1. The problem statement, all variables and given/known data 2. Relevant equations induced emf = - d(magnetic flux)/dt 3. The attempt at a solution I believe the graph will start initially curving upwards, because it begins to cut more and more flux lines which lead to an increased induced emf. Once it is "fully" within the magnetic field, it will slope downwards to a negative induced emf as it begins to cut flux lines in the other direction. The peaks will have the same induced emf as the velocity is constant so the rate of change of flux should be equal for entering and leaving the coil. My solution was like this: It's wrong, but I can't quite understand.