B) Two small identically charged balls are a certain distance apart. The vectors in the figure show the magnitude and direction of the electrostatic force on each ball due to the other one. Suppose that the charge of the left ball is now doubled (represented by two plus signs). Which vector diagram below best represents the forces that are now exerted on each of the two balls?
C) Four charged particles (two having charge +Q and two having charge -Q) are arranged in the x-y plane as shown in the figure. The charges are all equidistant from the origin. The amount of work required to move the fifth positively charged particle from point P to point O (both of which are on the z-axis) is positive, negative, or zero.
D) It depends on the path in which the charged particle is moved.