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Quick Answer: 

$Q=0.40Q_o, 0.37l \textrm{ from } Q_o \textrm{ between } Q_o \textrm{ and } 3Q_o$

Giancoli 7th Edition, Chapter 16, Problem 18


Chapter 16, Problem 18 is solved.

View sample solution


It seems that there is a small typo in your answer for the location for the charge. In the video you say that the location is .37l, not .27l. (~4:10 in video)

Hi williams.dpw, thank you very much for spotting that. I have updated the quick answer.

All the best,
Mr. Dychko