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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 5 0 to the power of o end exponent C with the other two junctions at 0 to the power of o end exponent C, the sensitive galvanometer gives a deflection of 14 divisions. When the temperature of junction 3 is kept 5 0 to the power of o end exponent C comma with the other two junctions at 0 to the power of o end exponent C comma the galvanometer gives a deflection of 11 divisions. Then the deflection given by the galvanometer, when temperature of the junction 2 is kept at 5 0 to the power of o end exponent C comma with the other two junctions at 0 to the power of o end exponent C comma will be

  1. 3 div    
  2. 11 div    
  3. 14 div    
  4. 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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