Question:
A potentiometer is considered a versatile and accurate device to make an electrical measurement of EMF. Why?
A potentiometer is considered a versatile and accurate device to make an electrical measurement of EMF. Why?
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A potentiometer measures EMF accurately as no current flows through the cell during null condition.
Updated On: Jun 12, 2025
- Because the method involves a combination
- There are cells involved
- Because of potential gradients
- As there is no flow of current through the galvanometer
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The Correct Option is D
Solution and Explanation
A potentiometer is used to measure EMF accurately because it works on the principle of null deflection.
When the galvanometer shows zero deflection, it indicates that no current flows through it, ensuring that the EMF of the cell is measured without drawing any current.
This avoids internal resistance effects, making the measurement highly accurate.
When the galvanometer shows zero deflection, it indicates that no current flows through it, ensuring that the EMF of the cell is measured without drawing any current.
This avoids internal resistance effects, making the measurement highly accurate.
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