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AP Physics 2
10.6 Capacitors
10.3 Electric Fields
IntermediateMCQConceptual18.6k
Cross-sectional diagram of two vertical parallel metal plates separated by distance d. The left plate has labels for charge +Q_0, and the right plate has labels for charge -Q_0. A shaded rectangular dielectric slab fills the region between the plates. On the left interior face of the dielectric facing the positive plate, a vertical row of negative bound charges -Q_p is drawn. On the right interior face facing the negative plate, a vertical row of positive bound charges +Q_p is drawn. A horizontal arrow labeled E_0 points from left to right. A smaller horizontal arrow labeled E_ind points from right to left inside the slab. No other labels, lines, text, or axes appear.
Parallel-plate capacitor with inserted dielectric slab.
A parallel-plate capacitor with plate area \(A\) and plate separation \(d\) is charged by a battery until it carries charge \(Q_0\). The capacitor is then disconnected from the battery so that it remains electrically isolated. A slab of uncharged dielectric material with dielectric constant \(\kappa > 1\) is inserted, completely filling the space between the plates. Which of the following best explains why the magnitude of the net electric field between the plates decreases after the dielectric is inserted?

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