1. The problem statement, all variables and given/known data At t=0, a rectangular coil of resistance R = 2 ohms and dimensions w = 3 cm and L = 8 cm enters a region of constant magnetic field B = 1.6 T directed into the screen as shown. The length of the region containing the magnetic field is LB = 15 cm. The coil is observed to move at constant velocity v = 5 cm/s. What is the force required at time t = 0.8 sec to maintain this velocity? F(0.8 sec) = ?? N 2. Relevant equations 3. The attempt at a solution This problem has a walkthrough to help me solve it, however I have reached the end of the walkthrough and tried using the equation but it isn't working for me. I find out the following in the walkthrough: the change in flux (dF/dt) through the loop is 1.6*0.03*0.05 the current can be calculated using V=IR and finally F = IwB so for the answer I try: (.05/2)*.03*1.6 but it keeps saying that it is wrong.