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The thermo emf of a thermocouple varies with the temperature $\theta$ of the hot junction as $E= a \theta + b \theta^2$ in volts where the ratio $a/b$ is $700^{\circ}C$. If the cold junction is kept at $0^{\circ}C$, then the neutral temperature is


( A ) $700^{\circ}C$
( B ) $1400^{\circ}C$
( C ) no neutral temperature is possible for this thermocouple
( D ) $350^{\circ}C$

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