If two conducting slabs of thickness `d_1` and `d_2`, and thermal conductivity `K_1` and `K_2` are placed together face to face as shown in figure in the steady state temperature of outer surfaces are `theta_1` and `theta_2`. The temperature of common surface is-

Two walls of thickness d_(1) and d_(2) and thermal conductivites K_(1) and K_(2) are in contact. In the steady state, if the temperature at the outer surfaces are T_(1) and T_(2) the temperature at the common wall is

Two walls of thicknes l_(1) and l_(2) and ther-mal condctivities K_(1) and K_(2) are in contact In the steady state, if the temperature at the outer faces are T_(1) and T_(2) find the temperature at the common wall .

If two metallic plates of equal thickness and thermal conductivities K_1 and K_2 ​are put together face to face and a common plate is constructed, then the equivalent thermal conductivity of this plate will be

Two walls of thickness d and d and thermal conductivities k and k are in contact. In the steady state, if the temperature at the outer T_(1) and T_(2) , the temperature at the common wall is

IF two metallic plates of equal thickness and thermal conductivities K_(1) and K_(2) are put together face to face anda common plate is constructed, then the equivalent thermal conductivity of this plate will be

If two metallic plates of equal thickness and thermal conductivities K_(1) and K_(2) are put together face to face and a common plate is constructed, then the equivalent thermal conductivity of this plate will be

Two plates each of area A thickness L_(1) and L_(2) thermal conductivities K_(1) and K_(2) respectively are joined to from a single plate of thickness (L_(1)+L_(2)) If the temperatures of the free surfaces are theta_(1) and theta_(2) Calculate (a) Rate of flow of heat (b) Temperature of interface .

Two materials having coefficients of thermal conductivity ‘3 K’ and ‘K’ and thickness ‘d’ and ‘3 d’, respectively, are joined to form a slab as shown in the figure. The temperatures of the outer surfaces are theta_(2) and theta_(1) respectively, (theta_(2) gt theta_(1)) The temperature at the interface is: