3 part hypothetical battery question

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SUMMARY

The discussion focuses on a problem involving two capacitors: a charged 3.50 µF capacitor connected to a 13.0 V battery and an uncharged 4.44 µF capacitor. Key calculations include determining the total stored energy before and after the connection of the capacitors, as well as the change in energy. The relevant equations include the energy stored in a capacitor, E = (1/2)CV², and the principles of charge conservation and equal voltage across connected capacitors.

PREREQUISITES
  • Understanding of capacitor fundamentals, including capacitance and energy storage.
  • Familiarity with the equation for energy stored in a capacitor: E = (1/2)CV².
  • Knowledge of charge conservation principles in electrical circuits.
  • Basic algebra skills for solving equations involving capacitors.
NEXT STEPS
  • Calculate the initial energy stored in the 3.50 µF capacitor before connection.
  • Determine the final voltage across both capacitors after they are connected.
  • Compute the total energy stored after the capacitors are connected.
  • Analyze the change in energy and its implications in capacitor circuits.
USEFUL FOR

Students studying electrical engineering, physics enthusiasts, and anyone looking to understand capacitor behavior in circuits.

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Homework Statement


A 3.50 µF capacitor is charged by a 13.0 V battery. It is disconnected from the battery and then connected to an uncharged 4.44 µF capacitor (Fig. 17-29).

17_28.gif

Figure 17-29
Determine the total stored energy at the following points in time.

(a) before the two capacitors are connected
____ J
(b) after they are connected
____ J
(c) What is the change in energy?
____ J


Homework Equations



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The Attempt at a Solution


No idea
 
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Didn't you find any relevant equation about the capacitor in your textbook?
For example, the relation between capacitor, charge stored in the capacitor and voltage across the plates of the capacitor. What is the expression for the energy stored in the capacitor?
 
After the capacitors are connected, the charges on the two capacitors must sum to the initial charge on C1. The voltage across the two capacitors must be equal. Write out equations representing these two facts, and solve for the voltage. Then remember that E=(1/2)CV^2.
 

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