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24_Chapter 16 HomeworkCH16 Electrical Energy and Capacitance

# 24_Chapter 16 HomeworkCH16 Electrical Energy and...

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58 CHAPTER 16 16.45 The capacitance of this parallel plate capacitor is ( ) ( ) 6 2 2 12 0 2 1.0 10 m C 8.85 10 N m 800 m A C d × =∈ = × = 8 1.1 10 F × With an electric field strength of 6 3.0 10 N C E = × and a plate separation of d , the potential difference between plates is 800 m = ( ) ( ) 6 9 3.0 10 V m 800 m 2.4 10 V V Ed = = × = × Thus, the energy available for release in a lightning strike is ( ) ( )( ) 2 8 9 0 F 2.4 10 V × × 2 1 1 1.1 1 2 2 W C V = = 10 3.2 10 J = × 16.46 The energy transferred to the water is ( ) ( ) ( ) 8 7 50.0 C 1.00 10 V 1 1 2.50 10 J 100 2 200 W Q V × = = = × ( ) v W m c T L = + Thus, if m is the mass of water boiled away, becomes ( ) 7 2.50 10 J 418 m × = 6 J 6 100 C 30.0 C 2.26 10 J kg kg C °
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