1. The problem statement, all variables and given/known data A bar of length 22 cm that slides on two rails are connected together to make a complete electrical circuit. A magnetic field of strength 0.05 T directed out of the paper exists throughout the regions of space in which this machine is located. Assume that the distance between the rails l=20 cm and that initiaully the bar's sliding velocity is v=12 cm/s. Find the magnitude of the emf induced in this circuit. 2. Relevant equations What equations should I be looking at? If it's an equation involving an integral, please give the final equation and possibly an explanation. 3. The attempt at a solution The only equation I have available to me is emf = integ(E * dl). I don't know how I would get the electric field with the variables given, and I also don't know how I would get dl, as I don't think the length of the rails is given, just the length of the bar going across the rails and the distance between the rails.