Verified Solution • 2025–26 Session
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QAIPM-2000-Ph-3042: NEET 2000 Physics - Class 12 AIPM-2000-Ph-3042 Solution: The potentiometer is best for measuring voltage, as
The potentiometer is best for measuring voltage, as
Multiple Choice Options
- A it has a sensitive galvanometer and gives null deflection
- B it has wire of high resistance
- C it measures p.d. in closed circuit
- D it measures p.d in open circuit.
Step-by-Step Verified Solution
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.