2. You are asked to design a charge storage device for a research center. Your g

Question

2. You are asked to design a charge storage device for a research center. Your goal is to store as much charge on a given device as possible. The facility allows you to generate almost any potential difference you need, but you are restricted to using a single parallel plate capacitor The area and separation distance of the plates are fixed. The dielectric materials available to you and their properties are listed in the table below |K(dielectric Constant)| 3.0 3.3 4.3 5.0 | Density (/) 250 1390 2648 2883 Material paper Mylar uartz mica Emax (V/m) 4.0E+07 4.3E+08 8.0E+06 2.0E+08 Which properties of these materials must you consider in choosing the best dielectric for you needs? Rank the materials in order of their ability to meet your needs, first choice first. a. b.

Explanation / Answer

a) K and Emax should be more and density should be less. But for research purpose, weight of capacitor should not matter, only the charge it store and potential difference it can tolerate, hence we should use Mica.

b) order is Mica > Quartz > Mylar > Paper

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