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transmission line - sound

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rednewguy

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why do we get a humming sound near a power transmission line?

Thanks.
 

In the realm of sound reinforcement (as in public address systems and loudspeakers), electric hum is often caused by induction. This hum is generated by oscillating electric currents induced in sensitive (high gain) audio circuitry by the alternating electromagnetic fields emanating from nearby mains-powered devices like power transformers. The audible aspect of this sort of electric hum is produced by amplifiers and loudspeakers.

Quoted from:
https://en.wikipedia.org/wiki/Mains_hum

Regards,
IanP
 

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