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A point charge q1 = 3.90 nC is placed at the origin, and a second point...

A point charge q1 = 3.90 nC is placed at the origin, and a second point charge q2 = -2.90 nC is placed on the x-axis at x=+ 21.0 cm. A third point charge q3 = 2.00 nC is to be placed on the x-axis between q1 and q2. (Take as zero the potential energy of the three charges when they are infinitely far apart.)

a- What is the potential energy of the system of the three charges if q3 is placed at x=+x=+ 10.0 cm?

b-Where should q3 be placed between q1 and q2 to make the potential energy of the system equal to zero?

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