Question

The hot and cold junctions of Iron-platinum and constantan -platinum thermocouples, when held at a temperature difference of 100 C generate thermo e.m.fs of $1600\mu V$ and $-3600\mu V$ respectively. The value of the e.m.f for Iron-constantan thermocouple in $\left(\mu V^0{C}^{-1}\right)$

• A. 14
• B. 25
• C. 28
• D. 50

Answer 1

Answer: (D)

50

The vale of emf of iron will be $E=\frac{1600-\left(-3600\right)}{100}=52\mu V^0{C}^{-1}=50\mu V^0{C}^{-1}$
NOTE; always check the unit in these type of question after that you will not be confused.