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A parallel-plate capacitor is constructed of plates with area 2.5 m2 that are separated by 0.5...

A parallel-plate capacitor is constructed of plates with area 2.5 m2 that are separated by 0.5 mm of air (dielectric constant Ka = 1:0006). The capacitor is connected to a 9 V battery and fully charged. The battery is then disconnected, and quartz is inserted to ll the gap between the plates (dielectric constant Kq = 4:3). Determine whether the energy density of this capacitor increased or decreased when the quartz was inserted, and by how much.

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