Rod Bearing +2q W +Q The figure above shows a long, nonconducting, massless rod of length L, pivoted at its center and balanced with a block of weight W at a distance x from the left end. At the left and right ends of the rod are attached small conducting spheres with positive charges q and 2q, respectively. A distance h directly beneath each of these spheres is a fixed sphere with positive charge Q. NOTE: Express your answer in terms of the given variables, use permittivity constant co. (a) Find an equation for the distance x when the rod is horizontal and balanced. x = (b) What value should h have so that the rod exerts no vertical force on the bearing when the rod is horizontal and balanced? h =

Rod Bearing +2q W +Q The figure above shows a long, nonconducting, massless rod of length L, pivoted at its center and balanced with a block of weight W at a distance x from the left end. At the left and right ends of the rod are attached small conducting spheres with positive charges q and 2q, respectively. A distance h directly beneath each of these spheres is a fixed sphere with positive charge Q. NOTE: Express your answer in terms of the given variables, use permittivity constant co. (a) Find an equation for the distance x when the rod is horizontal and balanced. x = (b) What value should h have so that the rod exerts no vertical force on the bearing when the rod is horizontal and balanced? h =