physics

A point charge of –3.00 μC is located at the origin; a point charge of 4.00 μC is located on the x axis at x = 0.200 m; a third point charge Q is located on the x axis at x = 0.320 m. The electric force on the 4.00 μC charge is 240 N in the +x direction. (a) Determine the charge Q. (b) With this configuration of three charges, at what location(s) is the electric field zero?

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