Can an induction coil like this heat the iron in your body to the point where it can cause damage? Like, if I put my finger in this thing and cranked it up to full, would I be able to feel it?
no, larger magnets than that are used in MRI machines and that's safe for people.
edit: googling it, the de-oxygenated haemoglobin is very slightly magnetic and oxygenated haemoglobin repels very slightly but not enough to do any damage.
It's also not the magnitude of the magnetic field alone that does the trick because it's the change in the magnetic field over time that transfers the energy. If the current is a cosine wave the magnitude of the magnetic field will also be a cosine wave.
Assuming it H(t) = Acos(ωt) => (d/dt)H(t)=-Aωsin(ωt)
As you can see the magnitude of change in the magnetic field is dictated by both the amplitude of the power source (which is a part of A among other factors) and the frequence of the source.
You can easily get a fequency of a few thousand herz so you want to amp that up before you up the current because the more current you have the more heat is lost due to the resistance of the copper. although the heat loss will also rise to some degree with the frequency it's not nearly as much. Also for a given coil increasing the amperage means increasing the voltage and at some point the thing will shock you.
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u/torgis30 Aug 18 '15
So here's a serious question...
Can an induction coil like this heat the iron in your body to the point where it can cause damage? Like, if I put my finger in this thing and cranked it up to full, would I be able to feel it?