To measure a resistance with the help of a potentiometer it is_________________?
Correct answer: B. not necessary to standardise the potentiometer
- A. necessary to standardise the potentiometer
- B. not necessary to standardise the potentiometer
- C. necessary to use a volt ratio box in conjunction with the potentiometer
- D. none of the above
Explanation
In resistance measurement by comparing potentiometer balance lengths, the potentiometer constant and working current cancel in the ratio, so prior standardisation is not required. Standardisation is needed when an absolute voltage value is required.
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