posted by Sarah .
use what you know about the motor priciple to explain the source of buzzing in power lines strung along roads.
so I think that this is because of the resistance caused by the conductors in the power grid. However I don't know how this would relate to the motor principle...
Perhaps it is because of the changing magnetic field around each wire carrying current alternating at 60 Hz. Could that changing field interact with anything to cause it to move?