The balancing length for a cell is 560 cm in a potentiometer experiment. When an external resistance of 10 Ω Ω is connected in parallel to the cell, the balancing length changes by 60 cm. If the internal resistance of the cell is 
, where N is an integer then value of N is ______.
Text Solution
Verified by ExpertsThe correct answer is:
CHECK THE SOLUTION.
(12)
Sol. Let the emf of cell is ε internal resistance is 'r' and potential gradient is x.
only cell connected:
ε = 560 x ……
After connecting the resistor
= 500x …..
from and
s
56 = 50 + 5r
r = 
= 1.2 Ω Ω
n = 12
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