My Favorite Web Application - Part 8

Previous posts: This is another one of my favorite web application because it has a ability to assign random values to various parameters in the problem. This is a simulation of a motional emf in the form of a rail gun. It actually is a straight-forward application of magnetic force acting on a straight current. One may also solve this using Faraday's law, but it is not as straight-forward to solve because the magnetic flux (or rather, the area) does not change uniformly since the rod is...