In a potentiometer experiment, it is found that no current passes through the galvanometer when ...

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In a potentiometer experiment, it is found that no current passes through the galvanometer when the terminals of the cell are connected across \( 52 \mathrm{~cm} \) of the potentiometer wire.
If the cell is shunted by resistance of \( 5 \Omega \), a balance is found when the cell is connected across \( 40 \mathrm{~cm} \) of the wire. Find the internal resistance of the cell
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