It is not a simple problem as it looks,there are many things which we have to keep into mind.Here is the prob~?

Two small positively charged spheres are suspended from a common point at the ceiling by the insulating light strings of equal length. The first sphere has mass m1 and charge q1 while the second one has mass m2 and charge q2. If the first string makes an angle Φ1 with the vertical, find the angle Φ2 that the second string makes with the vertical.