A charge of 2 q and -3 q are place fixed on the x axis, separated by distance d. Where should a third charge q be placed, so that it will not experience any net force.
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https://www.meritnation.com/ask-answer/question/two-particle-a-andbhaving-charges-8-0x10-6c-2-0x10-6c/electric-charges-and-fields/4951140