Published by:
CGP EDU Academic Team
Published on: September 12, 2026
Model a torch battery of length l to be made up of a thin cylindrical bar of radius 'a' and a concentric thin cylindrical shell of radius 'b' filled in between with an electrolyte of resistivity ρ (see figure). If the battery is connected to a resistance of value R, the maximum Joule heating in R will take place for
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
C
JEE Main 2020
Power in external 
This power is maximum, when 
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