[sdiy] MRI time dilation?

[danial stocks]

>
>WHY then does the aluminum block drop slower when placed in the MRI field?

most likely it is a generator effect.. a current is generated in a 
conductive object when moved in a magnetic field. in a highly conductive 
short circuit like the path around an aluminium block, that current can be 
very high. the current represents energy extracted from kinetic energy. thus 
the block resists motion and falls slower.. you can see the same effect by 
feeling the torque required to turn a good quality motor with its terminals 
open compard to short circuit...
I saw a neato demo of the effect once - a big electromagnet gap cant 
remeber, I think it was ac field.. put one solid aluminium plate in the gap, 
one with long grooves holes.. there are less eddy currents in the one with 
holes so it fals faster.. the solid one moves like it is in oil!!
Cheers,
Dan
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