18_InstSolManual_PDF_Part22

# 18_InstSolManual_PDF_Part22 - 18-22 Chapter 18 Q When the...

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18.86. Set Up: When the two capacitors are connected to each other, and where and are the charges on the two capacitors when they are connected to the line in parallel. Let and Solve: (a) In parallel, the voltage across each capacitor equals the line voltage. and (b) so and 18.87. Set Up: For capacitors in series, the equivalent capacitance is given by In series, the charge on each capacitor equals the charge on the equivalent capacitor. The energy stored in the three capacitors is equal to the energy stored in the equivalent capacitor. Solve: (a) gives (b) The total stored energy is Reflect: The three capacitors each have the same Q, so the capacitor has twice the voltage across it than is across each of the capacitors. We could also find the total stored energy by finding the energy stored in each of the three capacitors. 18.88. Set Up: The capacitor is equivalent to two capacitors in parallel, as shown in Figure 18.88. Each of these two capacitors have plates that are 12.0 cm by 6.0 cm. For a parallel-plate capacitor with dielectric filling the volume
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