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Three point charges of 1 C, 2 C and 3 C are placed at the corners of an equilateral triangle of side 100 cm. Find the work done to move these charges to the corners of a similar equilateral triangle of side 50 cm.

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$W = 9.9 \times 10^{10} J $
Hence A is the correct answer.
answered Jun 11, 2014 by meena.p

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