Three equal 1.75-μc point charges are placed at the corners of an equilateral triangle whose sides are 0.250 m long. what is the potential energy of the system? (take as zero the potential energy of the three charges when they are infinitely far apart.

Explanation:

As we know that electrostatic potential energy of a system of charge is given by equation

here we know that

now we also know that

r = distance between two charges = 0.250 m

now here three charges are placed at the vertices of the triangle

so here net electric potential energy of all three charges is 3 times the energy of one pair of charge

the entire statement is true and correct.  

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b. a lightning bug, plug of grass, and a worm