Chapter 2. Electrostatics Capacitors: Problem 2.40
Suppose the plates of a parallel-plate capacitor move closer together by an infinitesimal distance ?, as a result of their mutual attraction.
- Use equation (2.45) of Griffiths to express the amount of work done by electrostatic forces, in terms of the field E and the area of the plates A.
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- Use equation (2.40) of Griffiths to express the energy lost by the field in this process.