Question

Potentiometer circuit for measuring a small emf produced by a thermocouple. The meter wire pq

Answer 1

the circuit diagram shows the use of a potentiometer to measure a small emf produced by a thermocouple connected between X and Y. The cell C, of emf 2 V, has negligible internal resistance. The potentiometer wire PQ is 1.00 m long and has resistance 5 Ω.