Physics: Principles with Applications (7th Edition)

Published by Pearson
ISBN 10: 0-32162-592-7
ISBN 13: 978-0-32162-592-2

Chapter 17 - Electric Potential - Questions: 12


Yes. Yes. The positive work done in separating the plates increases the electric potential energy stored in the capacitor.

Work Step by Step

A force is indeed required to increase the separation, because a positively-charged plate is pulled away from a negatively-charged plate. These charges attract, so a force is necessary, and it will do positive work on the system. By equation 17-8, we see that the capacitance decreases because of the larger separation. Equation 17-7 shows us that the electric potential between the plates increases because the charge stays the same.
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