Consider at 22.4 %u03BCC charge at point A. a) Find the potential due to this ch

Question

Consider at 22.4 %u03BCC charge at point A.
a) Find the potential due to this charge at point B.
b) If a -13.7 %u03BCC charge is placed at point B, what is the electric potential energy stored by this system?

diagram: http://s10.postimg.org/mjssnswp5/image.png
***distance from point A to point B is 1.5 m

Consider at 22.4 %u03BCC charge at point A. Find the potential due to this charge at point B. If a -13.7 %u03BCC charge is placed at point B, what is the electric potential energy stored by this system?

Explanation / Answer

potential at B = V = kQ/R

V = 9*10^9 * 22.4nC /1.5 = 135 volts

b. potential energy U =   kq1q2/r

U = vq = 135* -13.7 = -1849.5 J

note: unts of charge are not clear so i assumned nano Coulombs

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