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Volymeter can not be used to measure emf...

Volymeter can not be used to measure emf to a cell potentiometer can be used to measure emf of a cell because

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The adjustment of a potentimeter is a null comparison method. At balance, the unknowm emf and the potential difference across the balancing length of the potentiometer wire are in opposition. Hene, the branch containing the unknown emf draws no current from the circuit are the null point.
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