The dielectric in a capaci tor serves two purposes. Itincreases the capacitance
Chapter 21, Problem 83(choose chapter or problem)
The dielectric in a capaci tor serves two purposes. Itincreases the capacitance, compared to an otherwise identicalcapacitor with an air gap, and it increases the maximumpotential difference the capacitor can support. Tf the electricfield in a material is s ufficiently strong, the material wi ll suddenlybecome able to conduct, creating a spark. The criticalfield strength, at which breakdown occurs, is 3.0 MY /m for air,but 60 MV/m for Teflon.a. A parallel-plate capacitor consists of two square plates, 15 cmon a side, spaced 0.50 mn) apart with only air betweenthem. What is the maximum energy that can be stored bythe capacitor?b. What is the maximum energy that can be stored if the platesare separated by a 0.50-mm-thick Teflon sheet?
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