Question

Electric wires or telephone wire become tight during winter and sag a little during summer why

Answer 1

The cores of telephone wires, ie, the parts of them that conduct electricity inside the insulation, are made of metal, usually copper. ... When wires heat up they expand, this causes them to be longer and therefore sag in summer. In winter the opposite happens.

Answer 2

Electric wires sag in summer and becomes tight in winter because solids expand when heated and contract when cooled

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