Explain how a potentiometer is used in sum & difference method
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To Measure e.m.f. of a Cell or to Compare e.m.f.s of Two Cells by Sum and Difference Method: Let E1 and E2 be the e.m.f.'s of the two cells to be compared by using the potentiometer. In this method both the cells whose e.m.f.s are to be compared are connected together.
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