The true statement for thermo e.m.f . of a thermocouple

Above neutral temperature, thermo e.m.f. in a thermocouple

Above neutral temperature, thermo e.m.f. in a thermocouple

Above neutral temperature, thermo e.m.f. in a thermocouple

Which of the following graphs represent variations of thermo emf (E) of a thermocouple with temperature t of the junction, the cold junction being kept at 0^(@)C ?

The expression for thermo emf in a thermocouple given by the relation E=40theta-(theta^(2))/(20) , where theta is the temperatue difference of two junctons. For this, the neutral temperature will be

In the following circuit fig, a 10m long potentiometer wire with resistance 1,2 ohm/m, a resistance R_1 and an accumulator of e.m.f. 2V are connected in series. When the e.m.f. of thermocouple is 2.4 mV the deflection in galvanometer is zero. The current supplied by the accumulator will be

The thermo e.m.f. of a thermocouple is 25 uV//"^@C at room temperature. A galvanometer of 40 Omega resistance, capable of detecting current as low as 10^-5A , is connected with the thermocouple. The smallest temperature difference that can be detected is

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

The thermo e.m.f E in volts of a certain thermocouple is found to very with temperature difference theta in ""^(@)C between the two junctions according to the relation E = 30 theta - (theta^(2))/(15) . The neutral temperatur e for the thermo - couple will be .