College Physics 10th Edition by Raymond Serway,Chris Vuille

تمرين 38

A small object with a mass of 350 g 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 4.00 cm. If the thread makes an angle of 15.08 with the vertical, what is the potential difference between the plates