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Electric potential energy and point charges

  • #1

Homework Statement


Two point charges , Qz= +5.00 nanoC and Q2= -3.00 nanoC, are separated by 35.00 cm.
a) What is the potential energy of the pair? What is the significance of the algebraic sign?
b) what is electrical potential at a point midway between the charges?
(here i'm supposing i'd do it the same way as in question a but divide the distance in half?)
c)how much work is required to bring a charge Q3=+2.00nanoC from very far away to the point midway between the charges


Homework Equations



Im guessing i have to use deltaV=delta PE/q= - Ed but im still not sure about how to proceed because i have coulombs and these equations work in volts.


Also, when it says separated by 35.0 cm, would this equal my height in the potential energy formula?
 

Answers and Replies

  • #2
537
2
There's no height. You're confusing it with gravitational potential energy. Look for a formula for the electrical potential energy for a system of point charges.
 

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