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In an experiment to find the internal re...

In an experiment to find the internal resistance of a cell by a potentiometer, a balance was obtained for 50 cm length of the potentiometer wire, with a cell of e.m.f. 2V. When the cell was shunted by a resistance of `2 Omega`, the balancing length of the potentiometer wire was 40 cm. What was the internal resistance of the cell ?

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