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

Correct answer: A condition of no current flow through the galvanometer

Solution

The potentiometer works on the principle of balancing the potential difference without drawing current from the source, ensuring accurate measurements of EMF.

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