3. 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 2 m when the cell is shunted by a 4 22 resistance and at 3 m when cell is shunted by a 8 2 resistance.
The internal resistance of cell is -
(A) 12
(B) 8
(C) 16
(D) 1
11
shown in
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