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

The Rate Of Increase Of Thermoemf With Temperature At The Physics QuestionThe Rate Of Increase Of Thermoemf With Temperature At The Physics Question

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

Options

(a) is positive
(b) is zero
(c) depends upon the choice of the two materials of the thermocouple
(d) is negative

Correct Answer:

is zero

Explanation:

We have, e = at + bt²
de/ dt = a + 2bt
At neutral temperature,
t = – a / 2b
de/ dt = 0

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