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The thermo e.m.f. of a thermocouple vari...

The thermo e.m.f. of a thermocouple varies with the temperature `theta` of the hot function of `E = atheta + btheta^2` in V where `a//b` is `700^@C`, If cold junction is kept at `0^@C`. Then neutral temperature is

A

`700^@C`

B

`350^@C`

C

`1400^@C`

D

no neutral temperature is possible for this thermocouple.

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