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Two metallic blocks M1 and M2 of same a...

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]

A

10 K

B

8 K

C

12.5 K

D

2 K

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