Singing of telephone wires in the wind occurs due to :
(a) Vibrations caused by birds as they sit on or get off, the wires
(b) Tensioning at the ends
(c) Magnus effect
(d) Generation of Karman Vortex street
(a) Vibrations caused by birds as they sit on or get off, the wires
(b) Tensioning at the ends
(c) Magnus effect
(d) Generation of Karman Vortex street