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Heat Transfer — PHYSICS STD 8 — Question

ICSE BoardEnglish MediumSTD 8PHYSICSHeat Transfer2 Marks
Question
The telephone wires break in winter.
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Answer

Metals expand on heating $($in summer$)$ and contract on cooling $($in winter$)$. Therefore while putting up the wires between two poles, care is taken that they are kept tight while laying them in winter as they sag in summer due to expansion.

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