College Physics 10th Edition by Raymond Serway,Chris Vuille

Exercise 50

Two positive charges each of charge q are fixed on the y -axis, one at y = d and the other at y = d as in Figure P16.66. A third positive charge 2 q located on the x -axis at x = 2 d is released from rest. Find symbolic expressions for (a) the total electric potential due to the first two charges at the location of the charge 2 q , (b) the electric potential energy of the charge 2 q , (c) the kinetic energy of the charge 2 q after it has moved infinitely far from the other charges, and (d) the speed of the charge 2 q after it has moved infinitely far from the other charges if its mass is m.