Two metallic blocks M 1 and M 2 of same area of cross-section are connected to each other (as shown in…

Two metallic blocks M1 and M2 of same area of cross-section are connected to each other (as shown in figure). If the thermal conductivity of M2 is K then the thermal conductivity of M1 will be : [Assume steady state heat conduction]

  1. 10K
  2. 8K
  3. 12.5K
  4. 2K

Solution

Let thermal conductivity of M1 be K'.

Using heat current relation for steady state conduction,

K'A100-8016=KA80-08

⇒K'×2016=K×808⇒K'=8K

Asked in: JEE Main 2022 (24 Jun Shift 1)

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