Three point charges form an equilateral triangle near the origin. Q1 = +5.00 uC at x = 2.5m, Q2 = -5.00 uC at x = -2.5m, both on the x-axis, and Q3 = +7.00 uC at y = 4.33m on the y-axis.
a) What is the value of the electric field E at the origin?
b) What is the electric potential at the origin?
c) What is the potential energy of these three charges?