Current Electricity Charging Discharging Of Capacitors Question 124
Question: Three wires of copper, iron and nickel are joined to form three junctions as shown in Fig. When the temperature of junction 1 is kept $ 50^{o}C $ with the other two junctions at $ 0^{o}C $ , the sensitive galvanometer gives a deflection of 14 divisions. When the temperature of junction 3 is kept $ 50^{o}C, $ with the other two junctions at $ 0^{o}C, $ the galvanometer gives a deflection of 11 divisions. Then the deflection given by the galvanometer, when temperature of the junction 2 is kept at $ 50^{o}C, $ with the other two junctions at $ 0^{o}C, $ will be
Options:
A) 3 div
B) 11 div
C) 14 div
D) 25 div
Show Answer
Answer:
Correct Answer: D
Solution:
At cold junction, current flows from copper to nickel and from iron to copper, and at hot junction from nickel to iron, thus the contributions add.
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