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Two cells having unknown emfs E1 and E2 ...

Two cells having unknown emfs `E_1` and `E_2` `(E_1 > E_2)` are connected in potentiometer circuit so as to assist each other. The null point is obtained at 8.125m from higher potential end. When cell `E_2` is connected so as to oppose cell `E_1`, the null point is obtained at 1.25m from the same end compare the emfs of two cells.

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