Q.The balancing length for a cell is 250 cm in a potentiometer experiment. When an external resistance of $5\Omega$ is connected across the cell, the balancing length becomes 200 cm. The internal resistance of the cell is

1.25\Omega

2.5\Omega

3.75\Omega

5\Omega

The correct solution involves applying the fundamental concept to derive the final value step by step...

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Q.The balancing length for a cell is 250 cm in a potentiometer experiment. When an external resistance of 5Ω5\Omega5Ω is connected across the cell, the balancing length becomes 200 cm. The internal resistance of the cell is