iran-konkur 2018 Q165

iran-konkur · Other · konkur-riazi_1397_specialized Not Maths
165. According to the figure below, the temperature difference across the two ends of rods A and B is equal, and the cross-sectional area of rod B is 2 times the cross-sectional area of rod A. If the thermal conductivity of rod A is 2.5 times the thermal conductivity of rod B, the thermal conductivity of rod A is how many times the thermal conductivity of rod B?
[Figure: Two rods A (top) and B (bottom) connected in parallel between temperatures $\theta_1$ and $\theta_2$]
  • [(1)] $1.25$
  • [(2)] $1.5$
  • [(3)] $4$
  • [(4)] $5$
\textbf{165.} According to the figure below, the temperature difference across the two ends of rods A and B is equal, and the cross-sectional area of rod B is 2 times the cross-sectional area of rod A. If the thermal conductivity of rod A is 2.5 times the thermal conductivity of rod B, the thermal conductivity of rod A is how many times the thermal conductivity of rod B?

\textit{[Figure: Two rods A (top) and B (bottom) connected in parallel between temperatures $\theta_1$ and $\theta_2$]}

\begin{itemize}
    \item[(1)] $1.25$
    \item[(2)] $1.5$
    \item[(3)] $4$
    \item[(4)] $5$
\end{itemize}