WAEC - Physics (2023 - No. 36)
The sagging of overhead electrical wires is caused by
radiation of heat.
rough handling.
gravitational attraction
Linear expansion
Explication
The sagging of overhead electrical wires is caused by linear expansion.
Linear expansion is the tendency of materials to expand in length when they are heated. When overhead electrical wires are heated by the sun, they expand and sag.
Linear expansion is the tendency of materials to expand in length when they are heated. When overhead electrical wires are heated by the sun, they expand and sag.