Question

The temperature across two different slabs A and B are shown I the steady state (as shown Fig) The ratio of thermal conductivities of A and B is
A. `2:3`
B. `3:2`
C. `1:1`
D. `5:3`

Answer 1

Correct Answer - B
`((dQ)/(dt))xx(1)/(A)=K_A((50-30))/(3)`
`=K_B((50-20))/(3)`
`2KA=3KB`
or, `KA//KB=3//2`