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Q.

In an experiment to measure the internal resistance of a cell by potentiometer, it is found that the balance point is at a length of 2m when the cell is shunted by a 5  Ω resistance, and is at a length of 3m when the cell is shunted by a 10  Ω resistance. The internal resistance of the cell is

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a

1.5  Ω

b

10  Ω

c

15  Ω

d

1  Ω

answer is B.

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Detailed Solution

r=l1 − l2l2 ×R'  =l1 − 22×5                 …..(i)r= l1 − 33×10                         …(ii)On solving (i) and (ii), r=  10  Ω
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In an experiment to measure the internal resistance of a cell by potentiometer, it is found that the balance point is at a length of 2m when the cell is shunted by a 5  Ω resistance, and is at a length of 3m when the cell is shunted by a 10  Ω resistance. The internal resistance of the cell is