Thermal Properties of Matter

JEE Main level, single correct, medium

110 of 126

Question 110 of 126

The figure shows a system of two concentric spheres of radii r1r_1 and r2r_2 and kept at temperatures T1T_1 and T2T_2 respectively. The radial rate of flow of heat in a substance between the two concentric sphere is proportional to

Show answer and solution

Answer: (C) r1r2r2−r1\frac{r_1 r_2}{r_2-r_1}

(dQdt)=(T1−T2)4πr1r2 K(r2−r1)\left(\frac{\mathrm{dQ}}{\mathrm{dt}}\right)=\left(\mathrm{T}_1-\mathrm{T}_2\right) \frac{4 \pi \mathrm{r}_1 \mathrm{r}_2 \mathrm{~K}}{\left(\mathrm{r}_2-\mathrm{r}_1\right)}

JEE Main question paper PDF

Open a shift to read the full paper on this page, or download it.

JEE Main 2025 Apr 2 Shift 1 question paper

Open Download PDF

Opening paper…

Explain it as a whiteboard videoStep-by-step, in Hinglish or English. Your first video needs no login.Solved it on paper but got it wrong?Upload a photo of your working. Mistake Doctor marks the exact line that broke.

More Physics practice

JEE Main Physics practice question on Thermal Properties of Matter (Conduction), with the answer and a step-by-step solution. Scan a question from your own book or paper to get a whiteboard video.