Question

Two rods of equal length and area of cross-section are kept parallel and lagged between
temperature 20°C and 80°C. The ratio of the effective thermal conductivity to that of the first rod is​

Answer 1

Answer:

7:6

Explanation:

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Answer 2

Thus the ratio between the thermal conductivity to the first rod is 7:6.

Explanation:

Question statement:

Two rods of equal length and area of cross-section are connected in parallel between temperatures 20oC and 80oC. If ratio of their thermal conductivities is 3 : 4, then the ratio of the effective thermal conductivity to that of the first rod is ?

Solution:

T1 = 20°C

T2 = 80°C

Ration of thermal conductivities = 3:4

Now

Kp = K1 + K2 / 2

Thus the ratio between the thermal conductivity to the first rod is 7:6.