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  4. A 2.0 V potentiometer is used to determine the internal resistance of a 1.5 V cell. The balance point of the cell in the open circuit is obtained at 75 cm. When a resistor of 10 Ω is connected across the cell, the balance point shifts to 60 cm. The internal resistance of the cell is :

Q. A potentiometer is used to determine the internal resistance of a cell. The balance point of the cell in the open circuit is obtained at . When a resistor of is connected across the cell, the balance point shifts to . The internal resistance of the cell is :

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Solution:

In a potentiometer internal resistance of cell is given as

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