a) Why do we prefer a potentiometer to measure the emf of a cell rather than a voltmeter?
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Why do we prefer a potentiometer to measure the emf of a cell rather than a voltmeter?

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 Potentiometer is based on a null method i.e.; it draws no current from the

cell. Emf of a cell is equal to terminal potential difference when no current

flows from the cell. Therefore, a potentiometer is preferred to measure the emf

of a cell rather than a voltmeter.

b)

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