P26_024 - 24. (a) The capacitance is 2 C 8.85 × 10−12...

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24. (a) The capacitance is C = ε 0 A d = ³ 8 . 85 × 10 12 C 2 N · m 2 ´ (40 × 10 4 m 2 ) 1 . 0 × 10 3 m =3 . 5 × 10 11 F=35pF . (b) q = CV = (35 pF)(600 V) = 2 . 1 × 10 8 C=21nC . (c) U = 1 2 CV 2 = 1 2 (35 pF)(21 nC) 2 =6 . 3 × 10 6 J=6 . 3 µ J. (d) E = V/d = 600 V / 1 . 0 × 10 3 m=6 . 0 × 10 5 V / m .
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