If two metallic plates of equal thicknesses and thermal conductivities K and K are put together face to face and a common plate

Question

If two metallic plates of equal thicknesses and thermal conductivities K and K are put together face to face and a common plate is constructed then the equivalent thermal conductivity of this plate will be MP PMT 1991 al a c K K K K K K 2 K K K K b d 2 K K K K K K 2 2K K

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