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Question: A charge +q is at the origin. A charge -2q is at x = 7.20 m on the +x axis.
(a) For what finite value of x is the electric field zero?
(b) For what finite values of x is the electric potential zero?
(Note: Assume a reference level of potential V = 0 at r = ? What is the smallest value of x in meters? What is the largest value of x in meters?
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