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How much work must be done to bring three electrons from a great distance apart to...

How much work must be done to bring three electrons from a great distance apart to 2.5×10−10 m from one another (at the corners of an equilateral triangle)? Express your answer using two significant figures.

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Answer #1

work done = increase in elecrostatic potential energy in forming the system of charges

ie., W = 3 x 9x10^9 e x e / d = 3 x9x10^9 x 1.6x10^-19 x1.6 x10^-19 / 2.5 x10^-10

= 2.8 x 10^-18 J.

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