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Three identical small metal spheres form an equilateral triangle of side length d = 3.5 cm....

Three identical small metal spheres form an equilateral triangle of side length d = 3.5 cm. Initially, q1 = +2.0 nC, q2 = +6.0 nC, and q3 = ?8.0 nC. Sphere 2 is first moved to touch sphere 1, then moved again to touch sphere 3, and finally returned to the original position. What now is the magnitude of the electrostatic force exerted on sphere 1 by the other two spheres (in N)?

The answer was: 1.0*10^4 N

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