A simple pendulum has a bob with mass m and charge q. The pendulum string has negligible mass. When a uniform and horizontal electric field E is…

A simple pendulum has a bob with mass $\displaystyle m$ and charge $\displaystyle q$. The pendulum string has negligible mass. When a uniform and horizontal electric field $\displaystyle \vec{E}$ is applied, the tension in the string changes. The final tension in the string, when pendulum attains an equilibrium position is $\displaystyle \_\_\_\_$. (g: acceleration due to gravity)