Question:
The accurate measurement of emf can be obtained using
The accurate measurement of emf can be obtained using
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Potentiometer = Ideal Voltmeter (Infinite Resistance).
Updated On: Apr 10, 2026
- multimeter
- voltmeter
- voltameter
- potentiometer
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The Correct Option is D
Solution and Explanation
Step 1: Mechanism
A voltmeter always draws some current from the cell during measurement, which leads to a potential drop across the internal resistance.
Step 2: Null Method
A potentiometer works on the "null deflection" method, meaning it draws no current from the cell when balanced.
Step 3: Conclusion
Because no current is drawn, the potentiometer measures the true electromotive force (emf) accurately.
Final Answer: (d)
A voltmeter always draws some current from the cell during measurement, which leads to a potential drop across the internal resistance.
Step 2: Null Method
A potentiometer works on the "null deflection" method, meaning it draws no current from the cell when balanced.
Step 3: Conclusion
Because no current is drawn, the potentiometer measures the true electromotive force (emf) accurately.
Final Answer: (d)
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