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IvaNMK
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Homework Statement
I do not understand why the PE is positive when 2 charges are the same sign, and PE is negative when 2 charges are opposite signs
Picture
Homework Equations
W = - Delta PE
The Attempt at a Solution
I don't know how the how the forces go. What it means by +, - PE
Basically I don't understand the ppt
Plz help
http://img222.imageshack.us/img222/7026/9661766768304be98ca8f23oj9.png
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