25_Chapter 16 HomeworkCH16 Electrical Energy and Capacitance

25_Chapter 16 HomeworkCH16 Electrical Energy and...

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Electrical Energy and Capacitance 59 (b) With air between the plates, the capacitance is ( ) () 42 2 12 13 0 2 3 2.00 10 m C 8.85 10 8.85 10 F Nm 2.00 10 m air A C d −− ×  =∈ = × = ×  ×  ( and with water ) 80 κ = ( between the plates, the capacitance is ) 13 11 80 8.85 10 F 7.08 10 F air CC == × ( The stored charge when water is between the plates is ) 11 10 7.08 10 F 6.00 V 4.25 10 C 42.5 nC QC V =∆= × = × = (c) When air is the dielectric between the plates, the stored charge is ( ) 13 12 8.85 10 F 6.00 V 5.31 10 C 5.31 pC air air =∆ = × = 16.49 (a) The dielectric constant for Teflon ® is 2.1 = , so the capacitance is ( ) ( )( ) 12 2 4 2 0 2.1 8.85 10 C 175 10 m 0.040 0 A C d × 2 -3 N m 10 m ×⋅ × 9 8.13 10 F 8.13 nF C = (b) For Teflon ® , the dielectric strength is
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