Why humming sound occur in extra high tension transmission lines?

Awaygood Answered Last
The noise is better described as 'buzzing', rather than 'humming', and it is caused by the breakdown of the air's insulating properties, due to stress caused by electric fields set up in the vicinity of where the conductors are supported from insulators. The noise is accompanied by a pale blue discharge which becomes visible after dark.
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In Physics

How does tension occur?

Tension is a force acting on a body and it occurs when the body is in a state of work.The direction of force acts on the opposite direction of work done.

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What animals make a humming sound?

these are the animals that make a humming noise: 1. humming bird2. alpaca3. locusts4. rabbitsthere are more,but that is how much i knowsorry!

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