Question

Telephone wires sag in hot sunny days explain why?

Answer 1

Because the cores of overhead wires are made from copper.

The higher temperatures in summer make the copper expand - so the lines get slightly longer. In winter, the reverse happens - the lines contract and tighten up

Answer 2

$\bf{\underline{\underline \green{AnswEr:-}}}$

• Why do telephone wires sag in summer and become tight during winters. Because the cores of overhead wires are made from copper.The higher temperatures in summer make the copper expand - so the lines get slightly longer. In winter, the reverse happens - the lines contract and tighten up.