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I have observed that the power lines buzz louder when there is less moisture in the air.

Why is this?

If it will help the lines are located on the foot hills of a nearby mountain.

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have a look at physics.stackexchange.com/a/45488/4020 – Yrogirg Dec 13 '12 at 9:04
Thanks @Yrogirg! – Velox Dec 13 '12 at 14:31

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