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Two rods of same length and cross-sectional area are joined in series. Thermal conductivity of the rods are in ratio of 2 : 1.

The ends are maintained at temperatures theta subscript A end subscript blank a n d blank theta subscript B end subscript as shown with theta subscript A end subscript greater than theta subscript B end subscript and sides are thermally insulated.
Which of the following graph represents temperature gradient (dT/dx) against x in steady state

  1.    
  2.    
  3.    
  4.    

The correct answer is:

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