$A$ thermocouple uses Bismuth and Tellurium as the dissimilar metals. The sensitivity of Bismuth is $-72\,\mu V/{^oC}$ and that of Tellurium is $500\,\mu V/{^oC}$. If the difference between hot and cold junction is $100\,{^oC}$, then the maximum output will be ............... $mV$.
- A$50$
- B$7.2$
- C$42.8$
- D$57.2$
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