Two charges of identical mass m, one with charge q, the other 4q, hang from strings of length I from a common point. Assume q is sufficiently small so that any angle you're looking for is very small, and find an approximate expression for the angle 0 each charge makes with respect to the vertical. - Check (show me!) that the units work out, and that the limiting behavior for large mass, large length, and small q are physically reasonable.