Good article! I never heard it described before that "the metal string becomes magnitize" in the presence if the pickup magnet. That may indeed be the physics. In electrical engineering parlarance you would say by Faraday's law of induction the vibrating string in the presence of the magnetic field would induce a voltage in coil of copper wire which then is the output of the guitar.
I think that particular statement is erroneous, if it "became" magnetized it would
remain magnetized. (edit: unless it was being
electro-magnetized with current, which it isn't)
Your explanation of the string's interference with the field inducing a voltage is what I was taught and what I still believe is the actual physics. (yeah you're right too, Geoguy)
Nonetheless the slight error doesn't negate the whole presentation. That only applies to logical proofs.
Actually their are a number of "laws" at play including Ampere's law, Lorentz, Gauss and others. Depends on the pickup design. These same laws also apply to loudspeaker design and microphone design.
All these "laws" may sound confusing. That is because different scientist discovered different aspects of E&M. The complexity and confusion all got straightened out a little over 200 years ago when James C. Maxwell tied it all together with four vector differential equations formally known as Maxwell's Equations. If I recall correctly Maxwell actually dedicated his work to Faraday. I beleive Faraday was his Physics professor. Faraday wasn't a mathematical guy. He found fame when he first documented Induction but fell out of favor when other scientist beleived the universe had an either that allowed E&M waves like light to travel. Once Maxwell published his work and showed no either was required for E&M wave propagation Faraday became extremely famous because he had extrapolated his induction law to also allow propagation. Maxwell gave a copy of hus equation treaties personally to Faraday.
Final factoid...somewhere around 10 to the -48 seconds after the Big Bang electrons formed and their movement created E&M fields and waves!
M
And don't mean to sound nit-picky, (you might have even been victimized by an over-zealous spell checker), but I believe when you said this: "when other scientist beleived the universe had an
either that allowed E&M waves like light to travel"
you actually meant "ether" (archaic form "aether")
https://en.wikipedia.org/wiki/Luminiferous_aether
Anyway hopefully that'll clarify what you meant for future readers.
Well said in spite of the glitch.
:friendly_wink:
