A small object with a mass of 390 mg carries a charge of 30.0 nC and is suspended by a thread between the vertical plates of a parallel-plate…

A small object with a mass of 390 mg carries a charge of 30.0 nC and is suspended by a thread between the vertical plates of a parallel-plate capacitor. The plates are separated by 2.00 cm. If the thread makes an angle of 12.0° with the vertical, what is the potential difference between the plates?