fiveworlds Posted March 11, 2018 Posted March 11, 2018 Magnets weakly repel organic tissue. How strong an electromagnet would be required to simulate artificial gravity and would a magnetic field that strong be harmful to a person?
EdEarl Posted March 11, 2018 Posted March 11, 2018 Magnets cannot "simulate" gravity. An MRI contains an extremely strong magnet, and I haven't felt any change in gravity when in one. The Large Haydron Colider has nearly 20 miles of strong magnets and no one has mentioned additional gravity, AFAIK.
fiveworlds Posted March 11, 2018 Author Posted March 11, 2018 Quote An MRI contains an extremely strong magnet, and I haven't felt any change in gravity when in one. Well yeah because the repulsion is really weak. You'd need a magnet even stronger again and I want to figure out how strong it would actually need to be.
swansont Posted March 11, 2018 Posted March 11, 2018 6 hours ago, fiveworlds said: Magnets weakly repel organic tissue. How strong an electromagnet would be required to simulate artificial gravity and would a magnetic field that strong be harmful to a person? When they levitated a frog it was a 16 Tesla magnet http://www.ru.nl/hfml/research/levitation/diamagnetic/ But why would this be thought to be a simulation of artificial gravity?
Strange Posted March 11, 2018 Posted March 11, 2018 59 minutes ago, swansont said: But why would this be thought to be a simulation of artificial gravity? It is, in the same way that an elevator is...
John Cuthber Posted March 11, 2018 Posted March 11, 2018 One fundamental property of gravity is that (at least as far as we know) it is always attractive. The diamagnetism of the body (mainly the water in the body) is always a repulsive force. It's hard to see one as a mimic of the other. It's also important to realise that the levitating frog relies on the gradient of the magnetic field, rather than the field itself and that a much stronger gradient (and hence field) would be needed for a human. https://xkcd.com/118/
swansont Posted March 11, 2018 Posted March 11, 2018 3 hours ago, Strange said: It is, in the same way that an elevator is... But it's in the wrong direction. In the absence of gravity, diamagnetism would push you away, not pull you in.
Strange Posted March 11, 2018 Posted March 11, 2018 7 minutes ago, swansont said: But it's in the wrong direction. In the absence of gravity, diamagnetism would push you away, not pull you in. Yes. For some reason, I read it as anti-gravity. You could mount the repulsive units (if such things were possible) in the ceiling...
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