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Physics 14 Online
OpenStudy (anonymous):

A particle with charge −7 μC is located on the x-axis at the point 8 cm, and a second particle with charge −4 μC is placed on the x-axis at 4 cm . What is the magnitude of the total electrostatic force on a third particle with charge −2 μC placed on the x-axis at 2 cm? The Coulomb constant is 8.9875 × 109 N · m2/C2. Answer in units of N I have absolutely no idea how to solve this...

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