A battery of unknown emf connected to a potentiometer has balancing length 
. If a resistor of resistance 
is connected in parallel with the cell the balancing length change by 
. If the internal resistance of the cell is 
, the value of 
is
Text Solution
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(12) JEE Main 2020
Let the emf of cell is 
internal resistance is 
andpotential gradient is 
.
only cell connected:
After connecting the resistor
from 
and 
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