A parallel plate capacitor of charge density k, is dipped into a liquid with density P. A bob of density d and mass m is suspended between the plates using a string of length l. The dielectric constant of the liquid is L, charge on bob is Q. Find the time period of oscillation.
kindly refer to this link for similar answer
https://www.meritnation.com/ask-answer/question/a-simple-pendulum-has-a-length-l-mass-of-bob-m-the-bob-is/electric-charges-and-fields/10263143