Why it is necessary to use the geometric means radius in the formula for the inductance caleulation whereas the formmula for the capacitance calculation uses the actual radius

Power System Analysis and Design (MindTap Course List)
6th Edition
ISBN:9781305632134
Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Chapter4: Transmission Line Parameters
Section: Chapter Questions
Problem 4.26MCQ: Does r=e14r=0.788r, which comes in calculation of inductance, play a role in capacitance...
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Why it is necessary to use the geometric means radius in the formula for the inductance caleulation whereas the formmula for the capacitance calculation uses the actual radius??
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