The emf developed by a thermocouple is measured with
the help of a potentiometer and not by a moving coil
millivoltmeter because
(a) the potentiometer is more accurate than the voltmeter
(b) the potentiometer is more sensitive than voltmeter
(c) the potentiometer makes measurement without
drawing any current from the thermocouple
(d) measurement using a potentiometer is simpler than
with a voltmeter
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option d
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