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For each of the following arrangements of two point charges, find all the points along the line passing through both charges for which the electric potential V is zero (take V = 0 infinitely far from the charges) and for which the electric field E is zero: (a) charges +Q and +2Q separated by a distance d, and (b) charges −Q and +2Q separated by a distance d. (c) Are both V and E zero at the same places? Explain.
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