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Q.

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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a

0.6  Ω

b

1.2  Ω

c

1.5  Ω

d

0.5  Ω

answer is C.

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Detailed Solution

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r=l1 − l2l2 ×R'  =60 − 5050×6=1.2 Ω

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