A simple pendulum consists of a small sphere of mass \( m \) suspended by a thread of length \( ...

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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 pendulum oscillate if the electrostatic force acting on the sphere is less than the gravitational force?
Hint: Electrostatic force is given by \( \mathbf{F}=q \mathbf{E} \)
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