A potentiometer is an accurate and versatile device to make electrical measurements of E.M.F. because the method involves:
A
A combination of cells, galvanometer and resistances
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B
Cells
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C
Potential gradients
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D
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 Potentiometer works on the principle of wheatstone bridge i.e no current flows through the galvanometer