The figure shows a 3.00 meter by 7.00 meter rectangular loop of wire with resistivity 3.90x10-6 Ohm-m and a resistance of 25.0 Ohms. Initially, the magnetic field is zero everywhere. However, after t = 0, B increases at 1.00 T/s out of the page everywhere above the dotted line, and increases at 1.00 T/s into the page everywhere below the dotted line.
What is the net force on the loop at t = 2.00 seconds? Be sure to indicate the net direction
F = IlB
I = E/R = BA/Rt
The Attempt at a Solution
I figured out the current in the loop and got I = .12A CCW
I'm not sure what to do about the force though. First off, the induced E is the same at every second, right? Second, what length do you use? I know if you had a bar or something moving you would use the length of the bar that lies in the B field, but no bar is moving here. And last but not least, how can you tell the direction of the force? I'm pretty sure the current would be equal at every part of the loop, so is the net force just 0? Thanks for the help :D