A set of point charges is held in place at the vertices of an equilateral triang

Question

A set of point charges is held in place at the vertices of an equilateral triangle of side 10.0 cm. Top part of the triangle has 25 g and -4.00nC. The bottom left part of the triangle has 18 g and -2.00 nC. And the bottom right part of the triangle has 15 g and -3.00 nC.

1. What is the electric potential energy of the -3.00nC charge? (Answer in joules)

2. What would be the maximum kinetic energy of the 3.00 nC charge if it were released from rest in the frictionless void of outer space? (Assume the other charges are held in place.) (answer in joules)

Explanation / Answer

U = kq1q2/r

U3 = kq1q3/r + Kq2q3/r

r = 10 cm = 0.1 m

U = k/r [ q1q3 + q2q3]

U = 1.62 x 10^-6 J

part 2 )

KEmax = PEinitial

KEmax = 1.62 x 10^-6 J

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