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AP Physics C: E&M
9.2 Electric Potential
9.1 Electric Potential Energy
IntermediateMCQConceptual22.8k
A Cartesian graph showing a single solid curve on axes labeled \(U(r)\) vertically and \(r\) horizontally. The horizontal axis represents \(U = 0\), with tick marks labeled \(r_1\), \(r_2\), \(r_3\), and \(r_4\) in order of increasing distance from the origin. The curve starts at a large positive value near the vertical axis, slopes downward steeply through the point corresponding to \(r_1\), and crosses the horizontal axis to reach a local minimum at \(r_2\). From \(r_2\), the curve rises with a positive slope, crosses above the horizontal axis, and reaches a rounded local maximum at \(r_3\). To the right of \(r_3\), the curve slopes downward through the point corresponding to \(r_4\) and approaches the horizontal axis asymptotically as \(r\) increases. Vertical dashed lines extend from each labeled tick mark on the horizontal axis up or down to the curve. No other labels, lines, text, or axes appear.
Potential energy \(U(r)\) versus separation distance \(r\) for a two-particle system.
The graph shows the electrostatic potential energy \(U(r)\) of a system of two interacting particles as a function of their separation distance \(r\). Four specific separations are labeled on the horizontal axis as \(r_1\), \(r_2\), \(r_3\), and \(r_4\). Which of the following statements correctly describes the nature of the electrostatic force or the stability of the system?

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