The internal resistance of a cell is to be determined using a potentiometer. In an experiment, an external resistance of R = 60 Ω is used across the given cell. When the key K1 is closed and K2 is open, the balance point is found at a length of 72 cm. The balance length on the potentiometer is found at 60 cm when both the keys are closed. Calculate the internal resistance of the cell.

The internal resistance of a cell is to be determined using a potentio

1.	The internal resistance of a cell is to be determined using a potentiometer. In an experiment, an external resistance of R = 60 Ω is used across the given cell. When the key K1 is closed and K2 is open, the balance point is found at a length of 72 cm. The balance length on the potentiometer is found at 60 cm when both the keys are closed. Calculate the internal resistance of the cell.
Answer» The internal resistance of a cell is to be determined using a potentiometer. In an experiment, an external resistance of $R$ $=$ $60 Ω$ is used across the given cell. When the key $K_{1}$ is closed and $K_{2}$ is open, the balance point is found at a length of $72$ $cm$ . The balance length on the potentiometer is found at $60$ $cm$ when both the keys are closed. Calculate the internal resistance of the cell.

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