In a potentiometer experiment, it is found that no current passes through the galvanometer when the terminals of the cell are connected across 0.52 m of the potentiometer wire. If the cell is shunted by a resistance of 5 Ω, balance is obtained when the cell is connected across 0.4 m of thewire. Find the internal resistance of the cell.

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0.5 Ω

1 Ω

1.5 Ω

2 Ω

answer is C.

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Detailed Solution

r=R l1l2−1 =5 0.520.4 −1 = 5 1.3−1 = 1.5 Ω

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