Potentiometer can be used
a) for measurement of emf of cell
b) to determine internal resistance of cell
c) for the calibration of Ammeter and Voltmeter
d) for measuring thermo-emf of a thermocouple

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Only (a), (b), (d) are correct

Only (a), (b) correct

All (a), (b), (c) (d) are correct

Only (a), (b), (c) correct

answer is D.

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Detailed Solution

A potentiometer can be used to measure the potential difference across any two given circuits and its sensitivity is very high. That is the reason it is used to calibrate voltmeters and ammeters. It can be used to measure emf and internal resistance of a cell. It can also be used to measure thermo-emf of a thermocouple.

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