system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: what causes the weird buzzing noises when you touch a 3.5mm jack plugged into a speaker?
gpt
Your body is acting like a radio antenna, and conducting that signal into the input of the amplifier. The most common local source of noise is going to be the magnetic fields generated by the power grid. So the noise is usually 50hz or 60hz depending on what country you live in.