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latest user's comments

#42 - Picture 06/27/2013 on How does one tank +1
#22 - Picture  [+] (3 replies) 06/25/2013 on E3 2013 +14
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#143 - nervaaurelius (06/25/2013) [-]
Can someone explain why he has meat hands...
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#147 - thewaronbeingcool (06/25/2013) [-]
'Ham fisted'
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#163 - nervaaurelius (06/25/2013) [-]
#10 - This is a example of demonstrating Eddy Currents. The interrup…  [+] (6 replies) 06/25/2013 on Gravity Machine +17
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#18 - shadownigga (06/25/2013) [-]
If this is the case, theoretically, can you put a super magnet in the bottom of a copper tube in the right way and the magnet move up the tube?
#20 - karlossacramento (06/25/2013) [-]
no, the movement of the magnet induces a current inside the tube, which in return slows down the magnet due to energy conservation. the force is determined by the speed of the magnet, the strength of the magnetic field and the conductivity of the tube. the force is always pointed against the movement, therefore you can neither accelerate the magnet in the direction of travel nor levitate it.

what you can do is drop a superconductor into a inhomogenic magnetic field and it would actually float.

there is another possibilty: it involves a counductive ring and an electromagnet which is powered by an AC-source. if you set it up in the right way, you can actually shoot the ring upwards, but that still involves energy from an external powersource.

look up electromagnetic induction if you're interested
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#24 - xakter (06/25/2013) [-]
So if the tube was made out of gold or graphene instead of copper, would the magnet fall faster or slower since both of those are better conductors of electricity than copper
#26 - karlossacramento (06/25/2013) [-]
the better the conductivity, the smaller the velocity.

the induced Voltage is proportional the the speed of the magnet.
with the following formula:

U = R*I => I = U/R and since B is proportionate to I, you can see that the lower the ressistance, the stronger the induced magnetic field for a fixed velocity and therefore a stronger force that is slowing down the movement. that means for a higher conductivity of the tube, the magnet falls slower.

about graphene: I'm not entirely sure if it is possible to reproduce this effect with graphene, since graphene is a material with the thickness of an atom(which might interfere with inductive events) and its conductive properties are not comparable to metallic conductivity. maybe it's possible, maybe it's not.
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#29 - critality (06/25/2013) [-]
This is fun as fuck to read, I enjoy how you explain things
#17 - anon (06/25/2013) [-]
it can actually be done with an empty toilet roll packed in with foil
#23 - Saved him the pain. 06/25/2013 on Summer +24