[ExI] Physical limits of electromagnetic launchers

[spike]

>... On Behalf Of Anders Sandberg
...

 

>.But maglev is electric charge, when you start looking at it
relativistically! A pure magnetic field will look like it has electrical
components when you move through it fast enough.  -- Anders Sandberg

 

 

 

Understatement, Dr. Sandberg.  Any mothion at any speed through a magnetic
field will induce an electric field, in accordance with Faraday's notion of
del cross E is the negative of partial derivative the magnetic field with
respect to time:

 



 

Moving through a magnetic field is the same as a changing magnetic field
from the point of view of the moving particle, which means maglev and any
electromagnetic propulsion will result in heating.

 

For a really interesting example of that, there is at Disneyland a roller
coaster (California Screamin') that is initially launched by maglev.  I
stood watching that for a while.  Immediately after each launch a number of
nozzles spray water on the track, which creates steam.  Kewallll.

 

spike 

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