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JEE Main202622 January 2026Morning ShiftPhysicsThermal Properties of MatterActual

Rods x and y of equal dimensions but of different materials are joined as shown in figure. Temperatures of end points A and F are maintained at 100^ C and 40^ C respectively. Given the thermal conductivity of rod x is three times of that of rod y , the temperature at junction points B and E are (close to):

Options

  1. A80^ C and 70^ C respectively
  2. B80^ C and 60^ C respectively
  3. C60^ C and 45^ C respectively
  4. D89^ C and 73^ C respectively

Correct answer

D. 89^ C and 73^ C respectively

Step-by-step solution

Let [ R = 3KA ] [ H = 100 - 40 11R 2 ] ...(1) H = 100 - T_B R .....(2) H = T_E - 40 3R .....(3) using (1) and (2) 120 = 1100 - 11T_A T_B = 89°C using (1) and (3) T_E = 73°C

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