A particle with a charge of 5.5×10−8 C charge is fixed at the origin. A particle with a charge of −2.3×10−8 C charge is moved from x = 3.5 cm on the x axis to y = 3.5 cm on the y axis. The change in the potential energy of the two-charge system is: 3.2×10−4 J −3.2×10−4 J 9.3×10−3 J −9.3×10−3 J 0 J