NEET 2000 Physics question

The potentiometer is best for measuring voltage, as :

(1)It has a sensitive galvanometer
(2)It has wire of high resistance
(3)It measures p.d. like in closed circuit
(4)It measures p.d. like in open circuitCorrect

Answer: (4)

Solution

At the balance point of a potentiometer no current flows through the galvanometer, hence no current is drawn from the cell or circuit being measured. The potentiometer therefore effectively behaves as an ideal voltmeter of infinite resistance and measures the emf or p.d. as

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Question ID VK-088577