(a) Three charges lying along the x axis. (b) The force exerted on q1 by q2 is F12, while the force exerted on q1 by q3 is F13.

Figure 18.13 (a) Three charges lying along the x axis. (b) The force exerted on q₁ by q₂ is F₁₂, while the force exerted on q₁ by q₃ is F₁₃.

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