How three charges (q, 2q, 8q) are placed on a line of length 18 cm. so that the potential energy of system is minimum
(1) http://www.onlinetestseries.in/data/images/common/papers/partners/32/724/image215.png
(2) http://www.onlinetestseries.in/data/images/common/papers/partners/32/724/image217.png
(3) http://www.onlinetestseries.in/data/images/common/papers/partners/32/724/image219.png
(4) http://www.onlinetestseries.in/data/images/common/papers/partners/32/724/image221.png
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