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Two positively charged point charges with charges equal to + 4Q and + Q are located a distance a from each other. See the figure

Two positively charged point charges with charges equal to + 4Q and + Q are located a distance a from each other. See the figure below.
Between these two-point charges, there is a point P where the total electric field is equal to zero.  Determine how far away from the charge + 4Q this point is.

P +4Q a

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