Torque and frequency

1. The problem statement, all variables and given/known data
A simple model of a polar molecule is a rod of length L with mass m where the charges q
and -q is arranged at each end of the rod. The molecule is located between two capacitorplates where spacing is on potential difference between the capacitor is V. The molecule will have a
equilibrium position (apart from gravity), but when the molecule is rotated away from the angle θ
equilibrium position will be affected by a torque τ.

a) Calculate the torque τ. Calculate the frequency f at which the molecule can perform small oscillations around the equilibrium position

3. The attempt at a solution
I think of using the force on the charges which is the charge * electric field strength, but i dont know how to express that, can someone help please

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