Homework Help: Physics

Posted by Youssef on Sunday, February 10, 2013 at 8:40pm.

Three charges are located at the corners of a rectangle as follows:
Charge A: lower left corner, -3.0 μC
Charge B: upper left corner, -6.1 μC
Charge C: upper right corner, +2.7 μC
The distance between A and B is 0.16 m and between B and C it is 0.25 m.
How much work must an external force acting on the particles (like, your hands) do in order to move the charges infinitely far from each other?

Physics - bobpursley, Sunday, February 10, 2013 at 9:46pm
Simple.

The energy to do this will be equal to the PE the system has:
PE=k(Q1*Q2)/d12 +k(Q1Q3)/d13 +kQ2Q3/d23

And what is neat, you do this by moving only two charges, that puts all three infinitely apart.

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