Parallel Plate Capacitor

  • #1

Homework Statement



A small object with a mass of 420 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 18.0° with the vertical, what is the potential difference between the plates?

Mass: 420 mg
Charge: 30.0 nC
Distance between plates: 2.00 cm
Thread of object: 18.0 degrees from vertical

Homework Equations



PE = -q(Vb-Va)
V = kq/r


The Attempt at a Solution



I just don't understand how the mass in the middle and the angle affects the problem.
 

Answers and Replies

  • #3
thanks!
 

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