NEET 2017 Physics question

A potentiometer is an accurate and versatile device to make electrical measurements of E.M.F, because the method involves :

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

Answer: (3)

Solution

In a potentiometer the unknown e.m.f. is balanced against the potential drop across a part of the wire, and the reading is taken at the null (balance) point where the galvanometer shows zero deflection. At balance no current is drawn from the cell whose e.m.f. is being measured, so there is no loss of potential across

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Question ID VK-092015