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AP Physics C: E&M
8.3 Electric Fields
8.1 Electric Charge and Electric Force
AdvancedMCQMathematicalConceptual15.7k
A two-dimensional Cartesian coordinate system with a horizontal x-axis and a vertical y-axis intersecting at an origin labeled O. The axes are drawn as solid black lines with arrowheads at the positive ends, labeled x and y respectively. On the vertical axis, two solid black filled circular dots representing point charges are located symmetrically above and below the origin: one dot at coordinate (0, d) labeled +q, and one dot at coordinate (0, -d) labeled +q. The distance along the y-axis from the origin to the upper charge is marked with a label d, and the distance to the lower charge is marked with a label -d. On the positive horizontal axis, an open circle is marked at a general point labeled (x, 0). Dashed straight line segments connect each of the two point charges to the point (x, 0). No other labels, lines, text, or axes appear.
Two identical positive charges fixed on the y-axis.
Two small particles, each carrying an identical positive charge \(q\), are held fixed on the \(y\)-axis at coordinates \((0, d)\) and \((0, -d)\), respectively. A point on the positive \(x\)-axis has coordinates \((x, 0)\). Which of the following expressions represents the position \(x > 0\) at which the magnitude of the net electric field attains its maximum value?

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