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Friday, 9 October

JEE Main 2023 · PhysicsNumerical answerNumerical valueEasyCalculation

JEE Main 13 April 2023, Shift 2, Physics Q53

Question 53 of 90 in this shift, Physics question 23 of 30, Section B.

Two plates A and B have thermal conductivities 84 Wm−1K−184\ \mathrm{Wm^{-1}K^{-1}} and 126 Wm−1K−1126\ \mathrm{Wm^{-1}K^{-1}} respectively. They have same surface area and same thickness. They are placed in contact along their surfaces. If the temperatures of the outer surfaces of A and B are kept at 100 ∘100\ ^\circC and 0 ∘0\ ^\circC respectively, then the temperature of the surface of contact in steady state is ______ ∘^\circC.

Official answer

40

NTA final key.

Chapter
Thermal Properties of Matter
Topic
Heat Conduction
Idea tested
Junction Temperature

Same idea in other shifts

Asked 3× in all
  1. 7 Apr 2025, Shift 2 · Q47Two cylindrical rods A and B made of different materials, are joined in a straight line. The ratios of lengths, radii and thermal…MediumNumerical value
  2. 24 Jun 2022, Shift 1 · Q50Two metallic blocks M1M_1 and M2M_2 of same area of cross-section are connected to each other (as shown in figure). If the thermal…MediumSingle correctHas a figure

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 42 of the 174 JEE Main shifts held from 2017 to 2026.