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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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