Thermocouples are used to measure temperature in the linear parts of the emf versus temperature ...

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Thermocouples are used to measure temperature in the linear parts of the emf versus temperature graph with cold junction at \( 0^{\circ} \mathrm{C} \). The thermo-electric power of \( \mathrm{Pt}, \mathrm{Ni} \) thermocouple are \( -4 \) and \( -20 \) microvolt per \( { }^{\circ} \mathrm{C} \) respectively. What will be the magnitudes of emfs of the thermocouple when the cold junction is at \( 0^{\circ} \mathrm{C} \) and the hot junction is at \( 100^{\circ} \mathrm{C} \) ?
(A) \( 4 \mathrm{mV} \)
(B) \( 2 \mathrm{mV} \)
(C) \( 3.2 \mathrm{mV} \)
(D) \( 1.6 \mathrm{mV} \)
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