An electron is accelerated through 2.4 x 105 V from rest and then enters a uniform 1.7 T magnetic field. What are the maximum and minimum values of the magnetic force this particle experiences? QV = 0.5mv2 F=QvB Basically, I've got a final value from the above equations, but I'm not sure how to get a maximum and minimum as the problem states. The first equation gives me a speed of 2.9*108 and then putting that into F=QvB gives me a force of 7.89*1011N. Is this the maximum? Why do a maximum and minimum occur, and how do I calculate them?