A wall consists of alternating blocks of length 'd' and coefficient of thermal conductivity k_(1) and k_(2) respectively as shown in figure. The cross sectional area of the blocks are the same. The equivalent coefficient of thermal conductivity of the wall between left and right is. . . . .

A wall consists of alternating blocks of length 'd' and coefficient of

1.	A wall consists of alternating blocks of length 'd' and coefficient of thermal conductivity k_(1) and k_(2) respectively as shown in figure. The cross sectional area of the blocks are the same. The equivalent coefficient of thermal conductivity of the wall between left and right is. . . . .
Answer» `(k_(1)+k_(2))/(2)` `(2k_(1)k_(2))/(k_(1)+k_(2))` `(k_(1)+k_(2))/(3)` `(3k_(1)k_(2))/(k_(1)+k_(2))` SOLUTION :Equivalent `K=(sumk_(i)A_(i))/(sumA_(i))` `=(k_(1)A+k_(2)A+k_(1)A+K_(2)A+k_(1)A+k_(2)A)/(6A)` `=(3(k_(1)+k_(2)A))/(6A)=(k_(1)+k_(2))/(2)`