Published by:
CGP EDU Academic Team
Published on: August 22, 2026
Two batteries (connected in series) of same emf 
of internal resistances 
and 
are connected to a load resistance of 
. Now an unknown resistance 
is connected in parallel to the load resistance. Find value of 
so that potential drop of battery having internal resistance 
becomes zero.
Text Solution
Verified by ExpertsThe correct answer is:
30
(30) If 
and 
are terminal voltage across the two batteries.
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