In a potentiometer experiment, the galvanometer shows no deflection when a cell is connected across 60 cm of the potentiometer wire. If the cell is shunted by a resistance of 6 Ω the balance is obtained across 50 cm of the wire. The internal resistance of the cell is

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0.5 Ω

0.6 Ω

1.2 Ω

1.5 Ω

answer is C.

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Detailed Solution

r=l1 − l2l2 ×R' =60 − 5050×6=1.2 Ω

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