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Points A, B, and C are at the corners of an equilateral triangle of side 7.00...

Points A, B, and C are at the corners of an equilateral triangle of side 7.00 m. Equal positive charges of 3.00 µC are at A and B.
(a) What is the potential at point C?
_________ kV

(b) How much work is required to bring a positive charge of 5.00 µC from infinity to point C if the other charges are held fixed?
___________________ J

(c) How much additional work is required to move the +5.00 µC point particle from point C to the midpoint of side AB?
_________________ J
I had looked at an example where the points made a square and I was confused on this problem mostly because I was not sure if i needed to take the angles of the force into account. Please help thanks :)

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