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## Homework Statement

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.

## Homework 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.

## 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.