1. The problem statement, all variables and given/known data A small object of mass m carries charge q and is suspended by a thread between the vertical plates of a capacitor. The plate separation is d. If the thread makes an angle [tex]\theta[/tex] with the vertical, what is the potential difference between the plates. 2. Relevant equations [tex]\Delta V=-Ed[/tex] [tex]C\Delta V=q[/tex] E = kq/r^2 C = e0*A/d 3. The attempt at a solution I drew a free body diagram, but since the length of the thread isn't given, it doesn't appear to help. I'm having a hard time finding a relationship between theta, m, d, and q. Any hints?