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The dielectric in a capacitor serves two purposes. It increases the capacitance, compared to an otherwise...

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Physics

The dielectric in a capacitor serves two purposes. It increasesthe capacitance, compared to an otherwise identical capacitor withan air gap, and it increases the maximum potential difference thecapacitor can support. If the electric field in a material issufficiently strong, the material will suddenly become able toconduct, creating a spark. The critical field strength, at whichbreakdown occurs, is 3.0 MV/m for air, but 60 MV/m for Teflon.


A parallel-plate capacitor consists of two square plates18cmon a side, spaced 0.60mmapart with only air between them. What is the maximum energy thatcan be stored by the capacitor?
Express your answer using two significant figures.
Uair=
7.7

Answer & Explanation Solved by verified expert
4.4 Ratings (560 Votes)
06mm is 061000 600106 m The plate area is 1717 289103 m2 Air The voltage that can be sustained by 060 mm of air dielectric is V 30106    See Answer
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