Published by:
CGP EDU Academic Team
Published on: August 23, 2026
In the potentiometer, when the cell in the secondary circuit is shunted with 
resistance, the balance is obtained at the length 120 cm of wire. Now when the same cell in shunted with 
resistance, the balance is shifted to a length of 180 cm . The internal resistance of cell is 
.
Text Solution
Verified by ExpertsThe correct answer is:
B
Let E is emf and r is internal resistance of cell.
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