Two rods of length `d_(1)` and `d_(2)` and coefficients of thermal conductivites `K_(1)` and `K_(2)` are kept touching each other. Both have the same area of cross-section. The equivalent thermal conductivity.

Two rods of length l_(1) and l_(2) and coefficients of thermal conductivities k_(1) and K_(2) are kept touching each other. Both have the same area of cross-section. The equivalent of thermal conductivity is

A wall consists of alternating blocks of length 'd' and coefficient of thermal conductivity k_(1) and k_(2) respectively as shown in figure. The cross sectional area of the blocks are the same. The equivalent coefficient of thermal conductivity of the wall between left and right is . . . . .

A wall consists of alternating blocks withlength 'd' and coefficient of thermal conductivity k_(1) and k_(2) . The cross sectional area of the blocks are the same. The equivalent coefficient of thermal conductivity of the wall between left and right is:-

A wall consists of alternating blocks withlength 'd' and coefficient of thermal conductivity k_(1) and k_(2) . The cross sectional area of the blocks are the same. The equivalent coefficient of thermal conductivity of the wall between left and right is:-

A composite slab is prepared by pasting two plates of thickness L_(1) and L_(2) and thermal conductivites K_(1) and K_(2) . The slab have equal cross-sectional area. Find the equivalent conductivity of the composite slab.

Two rods of length l and 2l thermal conductivities 2K and K are connected end to end. If cross sectional areas of two rods are eual, then equivalent thermal conductivity of the system is .