A thermocouple with one junction at ice-point , has emf given by the relation, `varepsilon =atheta+(1)/(2)btheta^(@)` , where `theta^(@)C` is the temperature of the hot junction. If the emf has the value 4.05 mV and 9.85 mV at `theta=100^(@)` C and `300^(@)C` respectively . What is the emf at `theta=500^(@)C` ?

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Correct Answer - 12.58 mV

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