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In an experiment to find emf of a cell u...

In an experiment to find emf of a cell using potentiometer,the length of null point for a cell of emf `1.5V` is found to be `60cm`.If this cell is replaced by another cell of emf `E`,the length of null point increases by `40cm`.The value of `E` is `(x)/(10)N`.The value of `x` is

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