Final Answer:
The temperature of inversion in thermocouples exhibits an inverse relationship with the temperature of the cold junction, meaning that as the cold junction temperature increases, the temperature of inversion decreases.Thus the correct option is: c) Inversely proportional
Step-by-step explanation:
The temperature of inversion is inversely proportional to the temperature of the cold junction. This means that as the temperature of the cold junction increases, the temperature of inversion decreases, and vice versa.
In thermocouples, the temperature of inversion refers to the temperature at which the thermoelectric EMF (electromotive force) becomes zero. The relationship between the temperature of inversion and the temperature of the cold junction is characterized by an inverse proportionality. As the cold junction temperature increases, the temperature of inversion decreases, resulting in a decrease in the thermoelectric EMF.
This inverse proportionality arises from the fundamental principles of thermoelectricity. The Seebeck effect, which is the basis of thermocouples, states that the EMF produced is proportional to the temperature difference between the hot and cold junctions. Therefore, an increase in the cold junction temperature leads to a reduction in the overall temperature difference, causing the temperature of inversion to decrease. Understanding this inverse relationship is crucial in the accurate measurement and calibration of thermocouples in various temperature-sensing applications.