Thank you in advance! A positive point charge, q1 = +7.00 x 10^-9 C, is held in

Question

Thank you in advance! A positive point charge, q1 = +7.00 x 10^-9 C, is held in position on the y-axis at y1 = 0.0100 m, as shown, This is the source charge. Point A is at the location (0.0200 m, 0.0100 m), and point B is at the location (0.0200 m. 0) a) A second point charge, q2 = +5.00 x 10^-9 C, is placed at point A. Determine the electric potential energy between the two charges. b) Then you move q2 to point B (while the other charge is held fixed). Determine the new electric potential energy between the two charges. c) How much work did you do in moving q2 from A to B?

Explanation / Answer

a) Electrical potential energy U1 = k*q1*q2/r = (9*10^9*7*10^-9*5*10^-9)/0.02= 15750*10^-9 J

B) elctrical potential energy U2 = (9*10^-9*7*10^-9*5*10^-9)/(0.02^2+0.01^2) = 630000*10^-9 J

C) W = U2-U1 = (630000-15750)*10^-9 = 614250*10^-9 J

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