P26_065.PDF

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Chapter 26 - 26.65

65. (a) They each store the same charge, so the maximum voltage is across the smallest capacitor. With

100 V across 10 µ F, then the voltage across the 20 µ F capacitor is 50 V andthe voltage across the

25 µ F capacitor is 40 V. Therefore, the voltage across the arrangement is 190 V.

(b) Using Eq. 26-21 or Eq. 26-22, we sum the energies on the capacitors andobtain U total =0 . 095 J.