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  4. Three rods of identical dimensions are arranged as shown. <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/physics/ddb5649773cb6340e020d30aaeba4468-.png /> Conductivity of the material of rods is k, area of crosssection of rods is A, length of each rod is l. Thermal resistance of the system between points A and D is, (Assume there are no losses due to radiation)

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Q. Three rods of identical dimensions are arranged as shown.
image
Conductivity of the material of rods is $k$, area of crosssection of rods is $A$, length of each rod is $l$. Thermal resistance of the system between points $A$ and $D$ is, (Assume there are no losses due to radiation)

Thermal Properties of Matter

Solution:

$R_{e f f}=\frac{5 R}{2}$
Here $R =\frac{\ell}{ KA }$
image