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Two point charges of magnitude -9.00 µC and -4.00 µC are placed along the x-axis at...

Two point charges of magnitude -9.00 µC and -4.00 µC are placed along the x-axis at x=0 cm and x=40.0 cm respectively. Where must a third charge q be placed along the x-axis so that it does not experience any net force between the other two charges? Please show work!

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