23. A simple pendulum consists of a small sphere of mass, m suspended by a thread of length, L. The sphere carries a positive charge, q. The pendulum is placed in a uniform electric field, E directed vertically downwards. Find the period of oscillation of the pendulum due to the electrostatic force acting on the sphere, neglecting the effect of the gravitational force. (CBSE 2019) Hint: Fig. 1.29 shows thes pherical pendulum of mass, m suspended by a thread of length, I having a positive charge, q. At any point, P the force experienced by the pendulum due to the 4 electric field, E is qE, vertically downward. tw E E qE sin Fig. 1.29 QE E cos