Posted by **Paula** on Thursday, February 14, 2013 at 7:49pm.

Three equal point charges, each with charge 1.50\mu C , are placed at the vertices of an equilateral triangle whose sides are of length 0.300m . What is the electric potential energy U of the system? (Take as zero the potential energy of the three charges when they are infinitely far apart.)

Use epsilon_0 = 8.85×10−12\frac{C^2}{N \cdot m^2} for the permittivity of free space.

how do I go about solving this problem? thank you very much for any guidance

- Physics 212 -
**bobpursley**, Thursday, February 14, 2013 at 8:00pm
potential energy is a scalar.

Take the first charge, move it. No energy change to move it.

Then move in the second charge, energy = kqq/d.

Now move the third charge in. It is opposed by the two other charge, energy= kqq/r * 2

add the energies: 3kqq/r

check my thinking.

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