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At neutral temperature, the thermoelectr...

At neutral temperature, the thermoelectric power `((dE)/(dT))` has the value

A

Maximum

B

Minim um

C

Zero

D

None of these

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Above neutral temperature, thermo e.m.f. in a thermocouple

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Assertion: When temperature of cold junction of a thermocouple is lowered, the value of neutral temperature of this thermo couple is raised. Reason: When the difference of temperature of two junction is raised. More thermo emf is produced.

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With the cold junction at 0^(@)C the neutral temperature for a thermo-couple is obtained at 270^(@)C . The cold junction temperature is now lowered to -10^(@)C Obta in the (a) neutral temperature (b) the temperature of inversion in this case.

If theta_i , is the inversion temperature, theta_n is the neutral temperature, theta_c is the temperature of the cold junction, then

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