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Current Electricity question

2000 · Q130
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Current Electricity question

2000 · Q130

NEETPhysicsCurrent ElectricityMCQ+4 / −1
The potentiometer is best for measuring voltage, as
  1. A
    it has a sensitive galvanometer and gives null deflection
  2. B
    it has wire of high resistance
  3. C
    it measures p.d. in closed circuit
  4. D
    it measures p.d in open circuit.
View written solutionFree

Correct answer: A

When we measure the emf of a cell by the potentiometer then no current draws in the circuit in zero-deflection condition i.e., cell is in open circuit. Thus, in this condition the actual value of a cell is found. In this way potentiometer is equivalent to an ideal voltmeter of infinite resistance.

Note: The emf by the potentiometer is measured from null method in which zero deflection position is found on the wire.

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