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AP Physics 2
10.7 Conservation of Electric Energy
10.5 Electric Potential
10.3 Electric Fields
AdvancedMCQProportional AnalysisConceptual18.1k
Two horizontal parallel conducting plates of length \(L\) are separated vertically by a distance \(d\). Vertical electric field lines labeled \(\vec{E}\) point uniformly downward from the top plate to the bottom plate. At the vertical midpoint on the left entrance of the plates, a horizontal arrow labeled \(\vec{v}_0\) points to the right into the region between the plates. A dashed curved line indicates a parabolic path bending upward toward the top plate, exiting the right side of the plates without contacting either plate. Labels \(L\) and \(d\) indicate the horizontal length and vertical separation of the plates, respectively. No other labels, lines, text, or axes appear.
Particle trajectory between parallel plates.
An electron and a proton are individually launched horizontally with the same initial speed \(v_0\) into a uniform electric field \(\vec{E}\) between two horizontal parallel plates of length \(L\) and separation \(d\), as shown. Neither particle strikes either plate while traveling between the plates. How does the kinetic energy gained by the electron, \(\Delta K_e\), compare to the kinetic energy gained by the proton, \(\Delta K_p\), upon exiting the region between the plates, and why?

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