Home
Class 11
PHYSICS
A slab consists of two parallel layers o...

A slab consists of two parallel layers of two different materials of same thickness having thermal conductivities `K_(1) and K_(2)`. The equivalent conductivity of the combination is

A

`K_1 +K_2`

B

`(K_1+K_2)/(2)`

C

`(2K_1K_2)/(K_1+K_2)`

D

`(K_1+K_2)/(2K_1K_2)`

Text Solution

Verified by Experts

The correct Answer is:
B
`K_(eq)=(K_1A_1+K_2A_2)/(A_1+A_2)=(K_1+K_2)/(2)` [as `A_1=A_2`]
Promotional Banner

Similar Questions

Explore conceptually related problems

A slab consists of two layers of different materials of the same thickness and having thermal conductivities K_(1) and K_(2) . The equivalent thermal conductivity of the slab is

Two rods of the same length and diameter, having thermal conductivities K_(1) and K_(2) , are joined in parallel. The equivalent thermal conductivity to the combinationk is

Consider a compound slab consisting of two different material having equal thickness and thermal conductivities K and 2K respectively. The equivalent thermal conductivity of the slab is

A slab consists of two parallel layers of different materials 4cm and 2cm thick and of thermal conductivities 54cals^(-1)m^(-1)K^(-1) and 36cals^(-1)m^(-1)K^(-1) respectively. If the faces of the slab are at 100^(@)C and 0^(@)C calculate the temperature of the surface dividing the two materials.

Two rods A and B of different materials are welded together as shown in figure. Their thermal conductivities are K_(1) and K_(2) . The thermal conductivity of the composite rod will be

Two rods A and B of different materials are welded together as shown in figure. Their thermal conductivities are K_(1) and K_(2) . The thermal conductivity of the composite rod will be

Three rods of same dimension are joined in series having thermal conductivity k_1 , k_2 and k_3 . The equivalent thermal conductivity is