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12. Three identical +1.0 C charges are each placed in a vertex of an equilateral triangle having sides of 1.0 m. A) Compute the total electric potential energy of the system. B) How much work must be done to enlarge the triangle with the charge on each vertex such that the sides now become 2.0 m in length? Practice C) If in the original triangle in part a), each positive charge is exchanged by a -1.0 C charge, compute the new total electric potential energy of the system