Physics-
General
Easy
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 
with the other two junctions at 
, the sensitive galvanometer gives a deflection of 14 divisions. When the temperature of junction 3 is kept 
with the other two junctions at 
the galvanometer gives a deflection of 11 divisions. Then the deflection given by the galvanometer, when temperature of the junction 2 is kept at with the other two junctions at will be
- 3 div
- 11 div
- 14 div
- 25 div
The correct answer is: 25 div
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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