This has to do with a Rail Gun. I'm stumped.

This problem explores how a current-carrying wire can be accelerated by a magnetic field. You will use the ideas of magnetic flux and the EMF due to change of flux through a loop.

A conducting rod is free to slide on two parallel rails with negligible friction. At the right end of the rails, a voltage source of strength

**V**in series with a resistor of resistance

**R**makes a closed circuit together with the rails and the rod. The rails and the rod are taken to be perfect conductors. The rails extend to infinity on the left. The arrangement is shown in the figure.

There is a uniform magnetic field of magnitude

**B**, pervading all space, perpendicular to the plane of rod and rails. The rod is released from rest, and it is observed that it accelerates to the left.

What is the acceleration

**a(t)(sub r)**of the rod? Take

**m**to be the mass of the rod. Express your answer as a function of

**V, B**, the velocity of the rod

**v(t)sub r, L, R**, and the mass of the rod

**m**.

I've tried fiddleling around with the units in the 6 variables but can't come up with acceleration. Thanks in advanced,

Matt