(a) Find the potential at points a and b in the figure below for charges Q1 = + 1.00 nC and Q2 = - 1.00 nC.
(Point A is 5cm from Q1, Q1 is 5cm from point B and point B is 5cm from Q2)
(b) How much work must be done by an external agent to bring a point charge q from infinity to point b?
I can get Va and Vb, I can't get the work done.
2007-02-03 09:39:25 · 2 answers · asked by David S 2 in Science & Mathematics ➔ Physics
Use conservation of energy and the definition for work that Work = Change in Kinetic Energy and set the potential at infinity tozero.
2007-02-03 10:23:07 · answer #1 · answered by meg 7 · 1⤊ 0⤋
Potential is by defenition the work done in bringing a unit positive charge from infinity to that point.
Work for q charge is potential at that point x q.
2007-02-03 19:56:44 · answer #2 · answered by Pearlsawme 7 · 0⤊ 0⤋