
College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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Question
. A parallel-plate capacitor of plate separation d is
charged to a potential difference DV0. A dielectric slab
of thickness d and dielectric constant k is introduced
between the plates while the battery remains connected to the plates. (a) Show that the ratio of energy
stored after the dielectric is introduced to the energy
stored in the empty capacitor is U/U0 5 k. (b) Give a
physical explanation for this increase in stored energy.
(c) What happens to the charge on the capacitor? Note:
This situation is not the same as in Example 26.5, in
which the battery was removed from the circuit before
the dielectric was introduced.
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