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A cell of emf 1.6 V is connected across a potentiometer wire of length 500 cm. The cell has negligible resistance. A thermo-couple whose cold junction is at 0ºC and hot junction at 80ºC is connected in the secondary circuit. The balancing length is found to be 125cm. Find the thermo emf per degree centigrade difference of temperature of the junctions.

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0.005V/ºC

0.05V/ºC

0.5V/ºC

5V/ºC

answer is A.

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Detailed Solution

$potential in the secondary = \frac{E}{L} l = e$

as there is no series resistance, no internal resistance of the battery in the primary circuit.

$\frac{1.6}{500} \times 125 = e = 0.4 V$

$Potential drop per degree K or {}^{0}C$

$\frac{0.4}{80} = 0.005 V / K$

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