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show a 2.0V potentiometer used for the d...

show a `2.0V` potentiometer used for the determination of internal resistance of a `1.5V` cell. The balance point of the cell in open circuit is `76.3` cm. When a resistor of `9.5Omega` is used in the external circuit of the cell, the balance point shifts to `64.8 cm` length of the potentiometer wire. Determine the internal resistance of the cell.

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