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    Question

    A potentiometer is an accurate and versatile device to

    make electrical measurements of E.M.F. because the method involves:
    A Potential gradients Correct Answer Incorrect Answer
    B A condition of no current flow through the galvanometer Correct Answer Incorrect Answer
    C A combination of cells, galvanometer and resistances Correct Answer Incorrect Answer
    D Cells Correct Answer Incorrect Answer

    Solution

    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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