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AP Physics 2
10.6 Capacitors
BeginnerMCQConceptual23.8k
A side-view diagram of a parallel-plate capacitor oriented horizontally. The top horizontal plate is labeled with charge +Q_0 and the bottom horizontal plate is labeled with charge -Q_0. A rectangular shaded block labeled dielectric constant \kappa completely fills the vertical gap of thickness d between the plates. Inside the dielectric block, a downward arrow labeled E_0 represents the primary electric field, and a shorter upward arrow labeled E_ind represents the induced polarization field. Dotted wire leads extend outward from each plate ending in open circles, indicating an open circuit disconnect. No other labels, lines, text, or axes appear.
An isolated parallel-plate capacitor with an inserted dielectric slab.
An isolated parallel-plate capacitor is charged so that its plates carry fixed charges \(+Q_0\) and \(-Q_0\). A slab of dielectric material with dielectric constant \(\kappa > 1\) is then inserted to completely fill the space between the plates. Which of the following best explains why inserting the dielectric slab increases the capacitance of the capacitor?

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