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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

a)

b)

c)

d)


Question ID - 151997 | Toppr Answer

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

a)

b)

c)

d)

1 Answer - 5876 Votes

3537

Answer Key : (d) -

(d)

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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