A positive point charge q is placed on the +y-axis at y = a, and a negative point charge –q is placed on the -y-axis at y = -a. A negative point charge - Q is located at some point on the + x-axis.
(a) In a free-body diagram, show the forces that act on the charge -Q.
(b) Find the x- and y-components of the net force that the two charges q and -q exert on
-Q. (Your answer should involve only k, q, Q, a and the coordinate x of the third charge.)
(c) What is the net force on the charge -Q when it is at the origin (x = 0)?
(d) Graph the Y-component of the net force on the charge - Q as a function of x for values of x between -4a and +4a.