what is the electric potential energy of this system of charges (physics! please help)?

moto

New member
Three charges are placed as follows along the x and y axis of an x-y coordinate system; q1 = 2.46 μC at (0, 0); q2 = -2.90 μC at (2.60 m, 0) and q3 = 7.16 μC at (0, 2.16 m). What is the electric potential energy of this system of charges?
 
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