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Two metallic blocks M 1 and M 2 of same area of cross-section are connected to each other (as shown in figure). If the thermal conductivity of M 2 is K then the thermal conductivity of M 1 will be : [Assume steady state heat conduction]

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

Correct answer: 8K

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