The motion of a magnet through a coil is analysed through a model of magnetic monopoles. The magnetic flux of a monopole passing through a loop is explained and also its rate of change. By a superposition of voltages produced by the monopoles on the coils the shape of the voltage versus time graph is explained. Also examined is the interaction of a magnet moving through a loop and the fall of a magnet through a solenoid, or independent loops and the fall of the magnet in a metal pipe. This software can help the student to apply principles of mechanics and improve understanding of graphs. (Contains 8 figures and 1 note.)