Two particles move along two different trajectories in an electric potential given by v(x, y) k x y, where k is a constant. a contour plot of the potential is shown (lighter color means higher potential, darker means lower potential). particle a, with charge q 6c takes the straight dashed line. particle b, also with charge q 6c takes the solid line curved path. the initial position is (x, y) (0.2, 0.2) m. the final position is (x, y) e (0.2, 0.7) m. which particle gains more electric potential energy? initial a) particle a b) particle b c) both gain the same amount of potential energy d) not enough information