1. The problem statement, all variables and given/known data The drawing shows a parallel plate capacitor that is moving with a speed of 31 m/s through a 4.0 T magnetic field. The velocity v is perpendicular to the magnetic field. The electric field within the capacitor has a value of 170 N/C and each plate has an area of 7.5 multiplied by 10 x 10^-4 m^2. What is the magnetic force (magnitude and direction) exerted on the positive plate of the capacitor? 2. Relevant equations F = Bqvsin(theta) --- sin() isn't important in this case because it's perpendicular Then there's also E = F/q and C = KEoA/d, but I can't for the life of me figure out how to use it in this case. 3. The attempt at a solution Well, I've established that I'm going to need to find the charge somehow from the electric field and the area of the plates, since all the other info for F = Bvq is given. I'm at a loss to figure out how to get the charge though... thanks in advance for any help/advice.