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The rate of increase of thermo-e.m.f. with temperature at the neutral temperature of a thermocouple

1. is positive
2. is zero
3. depends upon the choice of the two materials of the thermocouple
4. is negative

Correct answer: is zero

Solution

At the neutral temperature of a thermocouple, the thermo-e.m.f. reaches its maximum value, and its rate of change with temperature becomes zero.

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