The dielectric in a capacitor serves two purposes. As discussed in class, it increases the capacitance, compared to an o

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The Dielectric In A Capacitor Serves Two Purposes As Discussed In Class It Increases The Capacitance Compared To An O 1 (64.48 KiB) Viewed 50 times

The dielectric in a capacitor serves two purposes. As discussed in class, it increases the capacitance, compared to an otherwise identical capacitor with an air gap, but it also increases the maximum potential difference the capacitor can support. If the electric field in a material is sufficiently strong, the material will suddenly become able to conduct, creating a spark. The critical field strength, at which breakdown occurs, is 3.0 MV/m for air, but 60 MV/m for Teflon. Part A A parallel-plate capacitor consists of two square plates 14 cm on a side, spaced 0.45 mm apart with only air between them. What is the maximum energy that can be stored by the capacitor? Express your answer using three significant figures. ▸ View Available Hint(s) U air = Submit Part B U Teflon M Submit VEI ΑΣΦ Request Answer What is the maximum energy that can be stored if the plates are separated by a 0.45- mm-thick Teflon sheet? Express your answer using three significant figures. ▸ View Available Hint(s) ? ΨΕ ΑΣΦ J ? J