Two point charges Q1 = 3.3 µC and Q2 = 7.6 µC are initially very far apart. They are then brought together, with a final separation of 2.6 m. How much work does it take to bring them together?
[tex]\Delta[/tex]PE = ( k Q1 Q2 ) / r
Work = - [tex]\Delta[/tex]PE
k= 8.99 e 9
The Attempt at a Solution
PE final = k Q1 Q2 / r
= (8.99e9)(3.3e-6)(7.6e-6) / ( 2.6m)
= 0.0868 J
PE initial = k Q1 Q2 / r
with r initial being infinitely large PE initial is basically 0
so [tex]\Delta[/tex]PE = 0.0868 + 0
Work = - [tex]\Delta[/tex]PE = -0.0868
What is the error in this? Thank you!