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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?

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