Potential Difference V_ad: Solving with Switch S Closed

  • Thread starter Thread starter Black Armadillo
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SUMMARY

The discussion centers on calculating the potential difference V_ad after closing switch S in a circuit with initially uncharged capacitors and an applied potential difference of V_ab = +210V. The key equations involved are Q = C_eq * V and V_ab = Q / C. The solution requires understanding how to combine capacitors to find the equivalent capacitance (C_eq) after the switch is closed, particularly noting that points c and d will have the same potential.

PREREQUISITES
  • Understanding of capacitor circuits and their configurations
  • Knowledge of equivalent capacitance calculations
  • Familiarity with basic circuit analysis principles
  • Ability to apply the equations Q = C_eq * V and V_ab = Q / C
NEXT STEPS
  • Study how to calculate equivalent capacitance for series and parallel capacitor configurations
  • Learn about the behavior of capacitors in DC circuits
  • Explore the concept of potential difference in multi-capacitor circuits
  • Review circuit diagrams and how to simplify them for analysis
USEFUL FOR

This discussion is beneficial for students studying electrical engineering, particularly those focusing on circuit analysis and capacitor behavior in DC circuits.

Black Armadillo
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Homework Statement


The capacitors in the Figure are initially uncharged and are connected, as in the diagram, with switch S open. The applied potential difference is V_ab = + 210V

What is the potential difference V_ad after switch S is closed?

Homework Equations


Q=C_eq*V
V_ab=Q/C

The Attempt at a Solution


I really have no idea how to get started doing this problem. The first part of the problem asked "What is the potential difference V_cd?" This I found easy but once you close the switch I'm not sure how to approach the problem. Specifically how do you go about combining the capacitors to get a C_eq. Thanks for any help.
 

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Hi Black Armadillo! :smile:

Hint: the potential at c and d is the same, so draw the diagram again without the line cd, with the points c and d the same. :wink:
 

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