A parallel-plate capacitor consists of two square plates,
Chapter 23, Problem 23.34(choose chapter or problem)
A parallel-plate capacitor consists of two square plates, size L * L, separated by distance d. The plates are given charge {Q. What is the ratio Ef /Ei of the final to initial electric field strengths if (a) Q is doubled, (b) L is doubled, and (c) d is doubled? Each part changes only one quantity; the other quantities have their initial values.
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