Question

Why does telephone wire sag in hot summers

Answer 1

Answer:

Because the cores of overhead wires are made from copper. Metals expand with heat and contract with cold. 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.

Explanation:

Answer 2

Answer:

bcz the cord is coiled in other the length of wire is flexible i.e u can extend the cord by pulling and than it relaxes back to to some initial short length when putting the handset back