Q.The balancing length in a potentiometer experiment is $400$ cm when a resistor of $10\Omega$ is connected. When a $20\Omega$ resistor is connected, the balancing length becomes $200$ cm. The internal resistance of the cell is

5\Omega

10\Omega

15\Omega

20\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 in a potentiometer experiment is 400400400 cm when a resistor of 10Ω10\Omega10Ω is connected. When a 20Ω20\Omega20Ω resistor is connected, the balancing length becomes 200200200 cm. The internal resistance of the cell is