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# Solved: Suppose several different parallel-plate ISBN: 9780321696861 89

## Solution for problem 2DQ Chapter 24

Sears and Zemansky's University Physics with Modern Physics | 13th Edition

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Problem 2DQ

Suppose several different parallel-plate capacitors are charged up by a constant-voltage source. Thinking of the actual movement and position of the charges on an atomic level, why does it make sense that the capacitances are proportional to the surface areas of the plates? Why does it make sense that the capacitances are inversely proportional to the distance between the plates?

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Solution 2DQ

By definition, capacitance is the ability of a conductor to store energy in the form of electric charges. Mathematically, capacitance of a parallel plate capacitor is given as . Therefore, capacitance is directly proportional to the area of a plate and is the distance between the plates.

Now, the conductor will be able to hold more electrical charges if the plates have large area. This would increase the capacitance of the conductor. Therefore, the capacitance has to be proportional to the surface areas of the plates.

If the distance between the capacitor plates is high, the work done to move the charges between the plates would increase. Work done is directly proportional to potential difference as ,...

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##### ISBN: 9780321696861

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