What is the period of oscillation for small amplitudes? A ball with a net charge of +450

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What is the period of oscillation for small amplitudes?

A ball with a net charge of +450 nC and mass 0.75 g is suspended from a thread of length 12 cm in a uniform electric field of 8.0 kV/m downward. Do not ignore gravity. The system acts like a pendulum but with a downward electric force added to the gravitational force.

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