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AP Physics 2
10.6 Capacitors
10.5 Electric Potential
10.3 Electric Fields
BeginnerMCQConceptual15.9k
A side-view diagram of a parallel-plate capacitor oriented horizontally. Two thin horizontal rectangular plates of equal length are separated by a small vertical gap and positioned parallel to each other. The upper plate is drawn as a dark horizontal line with five positive sign labels '+' placed at equal intervals along its upper surface. The lower plate is drawn as a dark horizontal line with five negative sign labels '-' placed at equal intervals along its lower surface. In the interior space between the two plates, four parallel straight vertical vector arrows point straight down from the upper plate to the lower plate. These arrows are evenly spaced across the middle region and are labeled with the electric field vector symbol '\vec{E}'. No other labels, lines, text, or axes appear.
Electric field between parallel capacitor plates.
A parallel-plate capacitor consists of two flat conducting plates separated by a small air gap. When the capacitor is charged, a uniform electric field \(\vec{E}\) is established in the region far from the edges of the plates. Which of the following best explains why the electric field in electrostatic equilibrium must be perpendicular to the surfaces of the conducting plates?

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