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(C) The thermo $e.m.f.$ $(E)$ in a thermocouple is given by the relation $E = \alpha 	heta + \frac{1}{2} \beta 	heta^2$, where $	heta$ is the tempe

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Increases more rapidly in the beginning but less rapidly at higher temperatures

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(C) The thermo $e.m.f.$ $(E)$ in a thermocouple is given by the relation $E = \alpha 	heta + \frac{1}{2} \beta 	heta^2$, where $	heta$ is the temperature difference between the hot and cold junctions.As the temperature of the hot junction increases, the thermo $e.m.f.$ increases parabolically with temperature.Initially, the rate of increase is higher, but as the temperature approaches the neutral temperature, the rate of increase slows down.At the neutral temperature, the thermo $e.m.f.$ reaches its maximum value.Beyond the neutral temperature, the $e.m.f.$ starts to decrease and eventually becomes zero at the temperature of inversion.

As the temperature of the hot junction of a thermocouple is increased (while the cold junction is at a constant temperature), the thermo $e.m.f.$

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