Question: Three identical point charges of 4 pC each are located at the corners of an equilateral triangle 0.5 mm on a side in free space.

Three identical point charges of 4 pC each are located at the corners of an equilateral triangle 0.5 mm on a side in free space. How much work must be done to move one charge to a point equidistant from the other two and on the line joining them?

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