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...Plus anything metal on/in you would be violently ripped out. This would make the fields used for a typical MRI look mild by comparison.
by M_Grey 10y ago
...Plus anything metal on/in you would be violently ripped out. This would make the fields used for a typical MRI look mild by comparison.
- hwillis 10y agoInside a homogeneous magnetic field there is no force. It's kind of like being under very high pressure- humans can survive many hundreds of psi as long as the pressure is equal inside and outside the body. The danger comes when there is a gradient to the field, as happens outside the coil. Then ferromagnetic material wants to move from the low to high field, like high pressure water will want to move to low pressure. As long as you're inside the high field area, you're okay. This is part of the reason why people can be MRI'd even with shrapnel in their bodies. When the shrapnel is in the center of the volume being imaged, the field is relatively homogeneous except for the small induced gradient field. The shrapnel is already "touching the magnet", so it doesn't feel much more pull.
- M_Grey 10y agoWe're talking about using this in the context of "artificial gravity"... you're going to have a lot "outside of the coil" regions.
- hwillis 10y agoIt would all occur inside the coil, as the field and therefor diamagnetic force drops off cubically outside the field.
- M_Grey 10y agoConsidering the original comment to which I'm ultimately referring, can you actually imagine such as situation as it relates to humans and "artificial gravity"? Presumably we're talking about the scale of a space craft or station...
- hwillis 10y agoYeah, the entire station would be basically a giant solenoid. If you're outside the coil the artificial gravity doesn't work. You can have metal flying around without artificial gravity, but you can't get the artificial gravity in an environment that metal will accelerate inside.
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- dogma1138 10y agoNot necessarily be ripped out but it will heat up substantially.
- hwillis 10y agoOnly in an oscillating field. In an MRI the gradient coils cycle on and off rapidly (rapid in human terms), which causes minor hysteresis heating. In a static field there would be no heating.
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