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#Engineering

The balancing length for a cell is 560 cm in a potentiometer experiment. When an external resistance of $10\Omega$ is connected in parallel to the cell, the balancing length changes by 60 cm. If the internal resistance of the cell is $\frac{N}{10}\Omega$ , where N is an integer then value of N is
Option: 1 12
Option: 2 24
Option: 3 21
Option: 4 42

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