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The thermo e.m.f of a thermo-couple is given by , $\xi =a T +bT^2,$ where $a/b=-200^{\circ}C$. If the cold function is kept at $30^{\circ}$, then the inversion temperature is ($ \xi$ in volts, T is in centigrade):

\[\begin {array} {1 1} (1)\;103\;K & \quad (2)\;143\;K \\ (3)\;333\;K & \quad (4)\;443\;K \end {array}\]

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answered Nov 7, 2013 by pady_1

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