Finding the ratio of the inner and outer radii

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SUMMARY

The discussion focuses on calculating the inner and outer radii of a cylindrical air capacitor using the formula C/L = (2*pi*E_0)/(In(r_b/r_a)). The capacitor has a length L and stores energy W when subjected to a potential difference V, leading to a charge of 2W/V on each conductor. Participants explore the relationship between capacitance C, potential difference V, and energy, emphasizing the need for precise calculations to determine the radii of the conductors.

PREREQUISITES
  • Understanding of cylindrical capacitor theory
  • Familiarity with the formula for capacitance C
  • Knowledge of energy storage in capacitors
  • Basic logarithmic functions and their applications
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  • Research the derivation of the capacitance formula for cylindrical capacitors
  • Learn about the relationship between energy, capacitance, and potential difference
  • Explore practical applications of cylindrical capacitors in electronics
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Electrical engineers, physics students, and anyone involved in capacitor design and analysis will benefit from this discussion.

LostinPhysics
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I'm not sure how to use the formula in this problem (C/L = (2*pi*E_0)/(In(r_b/r/a)), A cylindrical air capacitor with a length of L stores an amount of energy equal to W when the potential difference between the two conductors is V. So the magnitude of the charge on each conductor would be 2W/V, now how do you calculate the radii of the inner and outer conductors?
 
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Is there is any other formula for energy involving capacitance C and potential difference V.
 

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