14_Ch 16 College Physics ProblemCH16 Electrical Energy and Capacitance

14_Ch 16 College Physics ProblemCH16 Electrical Energy and Capacitance

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48 CHAPTER 16 16.21 e kQ V r = so ( )( ) 92 2 9 8.99 10 N m C 8.00 10 C 71.9 V m e r VV ×⋅ × V == = 100 V, 50.0 V, and 25.0 V, = For V 0.719 m, 1.44 m, and 2.88 m r = The radii are inversely proportional to the potential. 16.22 (a) () ( ) 66 4.00 10 F 12.0 V 48.0 10 C 48.0 C QC V µ −− =∆= × = × = (b) ( ) 4.00 10 F 1.50 V 6.00 10 C 6.00 C V QC × = × = 16.23 (a) ( ) 62 2 12 8 0 2 1.0 10 m C 8.85 10 1.1 10 F N m 800 m A d ×  =∈ = × = ×   C (b) () () 86 1.11 10 F 3.0 10 N C 800 m 27 C max max max V C E d =∆ = × = 16.24 For a parallel plate capacitor, 00 Qd QQ V CA d ∆= = = ∈∈ A . (a) Doubling d while holding Q and A constant doubles
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