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Q.

In a potentio meter experiment, the balancing length with a cell is at a length of 240 cm. On shunting the cell with a resistance of 2 Ω, the balancing length  becomes 120cm. The internal resistance  of the cell is:

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a

4 Ω

b

2 Ω

c

1 Ω

d

0.5 Ω

answer is B.

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Detailed Solution

r=RL1−L2L2=2120120=2Ω
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In a potentio meter experiment, the balancing length with a cell is at a length of 240 cm. On shunting the cell with a resistance of 2 Ω, the balancing length  becomes 120cm. The internal resistance  of the cell is: