Two small equal point charges of magnitude q are suspended from a common point on the ceiling by insulating massless strings of equal lengths. They…

Two small equal point charges of magnitude q are suspended from a common point on the ceiling by insulating massless strings of equal lengths. They come to equilibrium with each string making angle $\displaystyle \theta$ from the vertical. If the mass of each charge is $\displaystyle m$, then the electrostatic potential at the centre of line joining them will be $\displaystyle \left(\frac{1}{4 \pi \epsilon_0}=\mathrm{k}\right)$.