A simple pendulum consists of a small sphere of mass \( m \) suspen...

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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 of strength E directed vertically upwards. With what period will the pendulum oscillate ? Assume that electrostatic force acting on the sphere is less than the gravitational force and the amplitude of oscillation is small.
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