34. Suppose two parallel plates in Fig. 4, cach has an area of 100 cm2and are 0.1 cm apart. The capacitor is connected to a power supply and charged to a potential difference V0 = 3000 V. It is then disconnected from the power supply. Which of the following values is closest to the total energy (U) stored in the capacitor in J?

(A)  
(B)
(C)
(D)  
(E)

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統計： A(0), B(0), C(1), D(1), E(5) #2993333

詳解 (共 1 筆)

#7295211
C= ε · A/d
U=1/2 · C · V2
ㅤㅤ
C=8.85x10-12x (100 x10-4 / 0.1 x10-2) = 8.85 x 10-11
ㅤㅤ
U= 1/2 x 8.85 x 10-11 x (3000)2 = 3.98 x 10-4
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