A potentiometer is an accurate and versatile device to make electrical measurements of E.M.F, because the method involves

a combination of cells, galvanometer and resistances

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cells

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potential gradients

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a condition of no current flow through the galvanometer

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Solution

The correct option is D a condition of no current flow through the galvanometer
A potentiometer is an accurate and versatile device to make electrical measurements of emf because the method involves a condition of no current flow through the galvanometer, the device can be used to measure potential difference, internal resistance of a cell and compare emf's of two sources.

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