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Question

Thermo couple is based on the principle of

A
Seebeck effect
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B
Thomson effect
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C
Pelteir effect
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D
Joule effect
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Solution

The correct option is D Seebeck effect
Seebeck Effect
An EMF is generated in a circuit containing two dissimilar metals when the two junctions are maintained at different temperatures.
A thermocouple is a temperature-measuring device consisting of two dissimilar conductors that contact each other at one or more spots, where a temperature differential is experienced by the different conductors by definition it is clear that it is based on seebeck effect.

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