TS EAMCET · Physics · Thermal Properties of Matter
A copper rod of length \(75 \mathrm{~cm}\) and an iron rod of length \(125 \mathrm{~cm}\) are joined together end to end. Both are of circular cross-section with diameter \(2 \mathrm{~cm}\). The free ends of the copper and iron are maintained at \(100^{\circ} \mathrm{C}\) and \(0^{\circ} \mathrm{C}\) respectively. The surfaces of the bars are insulated thermally. The temperature of the copper-iron junction is [Thermal conductivity of copper is \(386.4 \mathrm{~W} / \mathrm{m}-\mathrm{K}\) and thermal conductivity of iron is \(48.46 \mathrm{~W} / \mathrm{m}-\mathrm{K}\) ]
- A \(100^{\circ} \mathrm{C}\)
- B \(0^{\circ} \mathrm{C}\)
- C \(93^{\circ} \mathrm{C}\)
- D \(50^{\circ} \mathrm{C}\)
Answer & Solution
Correct Answer
(C) \(93^{\circ} \mathrm{C}\)
Step-by-step Solution
Detailed explanation
Let temperature of copper and iron junction is \(\theta\)…
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