Q. Two different metal slabs of identical length are joined in parallel. Their cross-sectional areas are $A$ and $2 A$ . If their thermal conductivity coefficients are $K_{1}$ and $K_{2}$ as shown then their equivalent conductivity for one dimensional steady heat transfer is

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$\frac{K _{1} + K _{2}}{2}$

65%

14%

15%

Solution: