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 $q_1$  while the second one has mass $m_2$  and charge $q_2$ .At equilibrium, the first string makes angle ${\theta }_1$ with the vertical and the second string makes an angle  ${\theta }_2$  with the vertical.