Question

Three rods made of the same material and having the same cross-section have been joined as shown in the figure. Each rod is of the same length. The left and right ends are kept at 0⁰C and 90⁰C respectively. The temperature of the junction of the three rods will be –

• A. 45⁰C
• B. 60⁰C
• C. 30⁰C
• D. 20⁰C

Answer 1

Answer: (B)

60⁰C

Answer 2

t = t₁ + t₂ =

$\frac{KA(T–0)}{L}$ = $\frac{KA(90–T)}{L}$ + $\frac{KA(90–T)}{L}$