Charges 7q and -q are located on the x axis at x = 0 and x =
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Question:
Charges 7q and -q are located on the x axis at x = 0 and x = a, respectively. You should find that some of the field lines that start on the 7q charge end up on the -q charge, while others head off to infinity. Consider the field lines that form the cutoff between these two cases. At what angle (with respect to the x axis) these lines leave the 7q charge? Hint: Draw a wisely chosen Gaussian surface that mainly follows these lines.
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