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A one-dimensional row of positive ions, each with charge +Q and separated from its neighbors by a distance d, occupies the right-hand half of the x axis. That is, there is a +Q charge at x = 0, x = +d, x = +2d. x = +3d, and so on out to ∞. (a) If an electron is placed at the position x = −d, determine F, the magnitude of force that this row of charges exerts on the electron. (b) If the electron is instead placed at x = −3d, what is the value of F? [Hint: The infinite sum
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