In this situation a bar magnet is moved at constant speed v toward a coil until the left end of the magnet is at the center of the coil. The magnet is held stationary for 3 seconds, and then moved to the right away from the coil with a speed v.
What does the graph of magnetic flux as a function of time look like? Assume positive flux corresponds to field lines passing through the coil to the left.
What does the graph of induced emf as a function of time look like?