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easyMCQNEET (UG) 20172026Physics
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A potentiometer is an accurate and versatile device to make electrical measurements of E.M.F, because the method involves:

  1. A
    Potential gradients
  2. B
    A condition of no current flow through the galvanometer
  3. C
    A combination of cells, galvanometer and resistances
  4. D
    Cells

Solution & Step-by-step Explanation

A potentiometer uses the null-deflection method. At balance, no current is drawn from the cell being measured. This prevents any voltage drop due to the internal resistance of the cell, making the measured terminal voltage exactly equal to the EMF.

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A potentiometer is an accurate and versatile device to make electrical measurements of E.M.F, because the method involves:
A
Potential gradients
B
A condition of no current flow through the galvanometer
C
A combination of cells, galvanometer and resistances
D
Cells

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