SI unit of thermal conductivity is
Jm-1s-1K-1
J s K
J m s K-1
J s-1 K
The SI unit of thermal conductivity is Jm-1s-1K-1.
A cylinder of radius r and of thermal conductivity k1 is surrounded by a cylindrical shell of inner radius r and outer radius 2r made of a material of thermal conductivity k2. The effective thermal conductivity of the system is
Two slabs A and B of different materials but of the same thickness are joined as shown in figure. The thermal conductivities of A and B are k1 and k2 respectively. The thermal conductivity of the composite slab will be