List of top Physics Questions on Pendulums asked in WBJEE

A simple pendulum of length \( l \) has a bob of mass \( m \), with a charge \( q \). On it a vertical sheet of charge with surface charge density \( \sigma \) passes through the point of suspension. At equilibrium, if the string makes an angle \( \theta \) with the vertical, then
A simple pendulum is taken at a place where its distance from the earth’s surface is equal to the radius of the earth. Calculate the time period of small oscillations if the length is 4.0 m. (Take \( g=\pi^2\,\text{m/s}^2 \) at surface.)
A simple pendulum is taken at a place where its distance from the Earth's surface is equal to the radius of the Earth. Calculate the time period of small oscillations if the length of the string is 4.0 m. (Take \( g = 9 \, \text{m/s}^2 \) at the surface of the Earth.)