Question

<CH 21 HW 14 of 15 Problem 21.85 Review Constants Periodic Table Part A The dielectric in a capacitor serves two purposes. It Increases the capacitance, compared to an otherwise identical capacitor with an air gap, and it increases the maximum potential difference the capacitor can support. If the electric field in a material is sufficiently strong, the material wil 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 A parallel-plate capacitor consists of two square plates 12 cm on a side, spaced 0.50 mm apart with only air between them. What is the maximum energy that can be stored by the capacitor? Express your answer in joules. VALD > ? J Submit Besvest Answer Part B What is the maximum energy that can be stored if the plates are separated by a 0.50-mm. thick Teflon shoot? Express your answer in joules. ΟΙ ΑΣΦ ? Uus J Submit Pewest A Provide Feedback Next > Pearson Copyright 2020 Pearson Education Inc. All rights reserved. Terms of Use Priva stringhysics commetterview assignment

Answer 1

Given, Vi = 3 m vim V2 = 60 mV/m a = 12 cm, d-0.50mm :.dc 5x10 -3 Areas 0.12 x0012=1404x103m2 A) For air, C- A E V= 3x106x0.5X10-3 = 1500V. - ALOE 140410-3x8.85x10-12 - 255 P F. 0.5X10-3 :: E=LCV2 = § (255*10*19) (1500)* = 286x106T B) For Teffon, V= 60x100x0.5X10-3 - 30,000 V. 1404x10-3 x 8.8 5x10-12x20) = 5-35x10-F ::E: (5.35 x10-6) (30000)? = 0.243 :A) Vair o-bg. B) Utelion = 0.247: ca O 5X10-3 = 286 X10