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751_Physics ProblemsTechnical Physics

751_Physics ProblemsTechnical Physics - Chapter 26 P26.45...

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Chapter 26 91 P26.45 C A d = κ 0 or 95 0 10 3 70 8 85 10 0 070 0 0 025 0 10 9 12 3 . . . . . × = × × e j b g A A = 1 04 . m P26.46 Consider two sheets of aluminum foil, each 40 cm by 100 cm, with one sheet of plastic between them. Suppose the plastic has κ 3 , E max ~10 7 V m and thickness 1 mil = 2 54 . cm 1 000 . Then, C A d V E d = × × = × κ 0 12 5 6 7 5 2 3 8 85 10 0 4 2 54 10 10 10 2 54 10 10 ~ . . . ~ ~ . ~ max max C N m m m F V m m V 2 2 2 e je j e je j P26.47 Originally, C A d Q V i = = 0 a f . (a) The charge is the same before and after immersion, with value Q A V d i = 0 a f . Q = × × × = 8 85 10 25 0 10 250 1 50 10 369 12 4 2 . . . C N m m V m pC 2 2 2 e je j a f e j (b) Finally, C A d Q V f f = = κ 0 a f C f = × × × = 80 0 8 85 10 25 0 10 1 50 10 118 12 4 2 . . . . C N m m m pF 2 2 2 e je j e j V Qd A A V d Ad V f i i a f a f a f = = = = =
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