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Three point charges q, 2q and 8q are to ...

Three point charges q, 2q and 8q are to be placed on a
. 9cm long straight line. Find the
. positions where the charges shouldbe placed such that the potential energy
. of this sysrem is minimum. In this situation, what is the
. electric field at the charge q due to the other two charges?

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The correct Answer is:
Q at a distance of `10/3` cm from 2Q between 2Q and 8Q, E=0
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