How Is the Potential Difference Calculated in a Suspended Charge Scenario?

[sarah_a289]

A point charge of mass 0.0836 kg and charge q = +6.84 μC is suspended by a thread between the vertical parallel plates of a parallel-plate capacitor, as shown in the figure below.


If the angle of deflection is θ = 22.3°, and the separation between the plates is d = 0.0221 m, what is the potential difference between the plates?


sorry it wouldn't let me paste the picture..

 

[Mindscrape]

If you know the gravitational force and most of the details about the electric force you can use trigonometry to figure out how they relate. How far are you?