Comment on No need to boil the ocean
Holzbesteck@feddit.org 2 weeks agoThe earths magnetic field influences the needle when I am standing 400+ km away from magnetic north. To have the coil of a transformer influence my needIe, I have to be relatively close to it. So I feel like your statement is incorrect.
I’ll happily be corrected if I overlooked or misunderstood something.
smeenz@lemmy.nz 2 weeks ago
The field isn’t located at the north or south pole - you’re not 400km away from it, you’re immersed inside the field, and your compass is showing the local alignment of that field.
Just about anything with an EM field of its own will be stronger than that.