A composite rod made of three rods of equal length and cross-section as shown in fig. The thermal conductivites of the materials of the rods are `K//2`, `5K` and `K` respectively. The end `A` and end `B` are at constant tempertures. All heat entering the face `A` goes out of the end `B` there being no loss of heat from the sides of the bar. The effective thermal conductivity of the bar is A. `15K//16`B. `6K//13`C. `5K//16`D. `2K//13`

A composite rod made of three rods of equal length and cross-section a

1.	A composite rod made of three rods of equal length and cross-section as shown in fig. The thermal conductivites of the materials of the rods are `K//2`, `5K` and `K` respectively. The end `A` and end `B` are at constant tempertures. All heat entering the face `A` goes out of the end `B` there being no loss of heat from the sides of the bar. The effective thermal conductivity of the bar is A. `15K//16`B. `6K//13`C. `5K//16`D. `2K//13`
Answer» Correct Answer - A

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