The thermo emf of a thermocouple is given by, E=a T+b T^2 , where a b =-200^ C . If the cold function is kept at 30^ C , then the inversion temperature is ( in volt, T in centigrade)

Step-by-step solution

At temperature of inversion E=0 E=a T+b T^2 0=a T+b T^2 or T=- a b =200^ C Because the cold function is kept at 30^ C , then the inversion temperature T=200-30=170^ C T=273+170=443 ~K