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## Homework Statement

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?

## Homework Equations

[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!

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