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Magnet Falling Through Ring Model written by Francisco Esquembre post and replies

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Magnet Falling Through Ring Model written by Francisco Esquembre - Feb 3, 2012 at 12:23PM
lookang Avatar
lookang
107 Posts

Magnet Falling Through Ring Model written by Francisco Esquembre
http://www.compadre.org/osp/items/detail.cfm?ID=10327

Hi Prof Paco!
i have a question about this computer model.
is the length of the magnet a variable programmed into the codes?
i cant seems to follow the codes if indeed if it is programmed.

i tried to lengthen the magnet but the simulation still gives the same emf graph as if the length is the same.

the end goal is to allow 2 magnetic dipoles at each end of the magnet so that if the magnet is longer, the peaks of the emf is further apart.

my work and discussion with teachers can be found here http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=2066.0

attached is my remixed source code for your consideration to advice me how to change the codes or you may wish to release your own more powerful model that allows the length of magnet to be varied:)

thanks!

Post edited February 3, 2012 at 12:19 PM EST.

Post edited February 3, 2012 at 12:21 PM EST.

Post edited February 3, 2012 at 12:22 PM EST.

Post edited February 3, 2012 at 12:22 PM EST.

Attached File: ejs_MagnetFallingThroughRingwee.zip


http://weelookang.blogspot.sg

Replies to Magnet Falling Through Ring Model written by Francisco Esquembre

Re: Magnet Falling Through Ring Model written by Francisco Esquembre - Feb 03 2012 12:36PM
Francisco Esquembre
124 Posts

Hi Wee,

If I remember it well, the magnet is modeled as if it were a magnetic dipole. Hence, the length of the magnet makes no difference...
But, please, don't press me hard on the physics side of it! :-)
Someone else provided me with the equations.

I'll be glad if you can improve the model to a more realistic magnet. But the physicists that worked with me told me this was a far from trivial issue.

Cheers,
Paco



Re: Re: Magnet Falling Through Ring Model written by Francisco Esquembre - Feb 03 2012 12:53PM
lookang Avatar
lookang
107 Posts

hi paco!

noted with thanks!

i will ask wolfgang and friends since i am in http://aapt.org/Conferences/wm2012/workshops.cfm

cheers!

the physics is beyond me too hahaha.


http://weelookang.blogspot.sg


Re: Re: Magnet Falling Through Ring Model written by Francisco Esquembre - Feb 03 2012 3:18PM
lookang Avatar
lookang
107 Posts

Hi prof paco,
according to this http://www.fisica.uniud.it/URDF/mptl14/ftp/full_text/ws4.pdf
an  EJS experiment: magnet falling through copper tube already exists through the great efforts of MOSEM2 project.
any chance of releasing it on OSP?

for your consideration :)


http://weelookang.blogspot.sg


Re: Re: Re: Magnet Falling Through Ring Model written by Francisco Esquembre - Feb 03 2012 6:10PM
Francisco Esquembre
124 Posts

Wee,

It should be the same one. I did this simulation and put it in ComPadre, didn't I?

Paco



Re: Re: Re: Re: Magnet Falling Through Ring Model written by Francisco Esquembre - Feb 03 2012 9:35PM
lookang Avatar
lookang
107 Posts

copper tube = solenoid = appears you may have already created this copper tube version in 2009. i didn't see it in OSP, it is available? see attachment, looks awesome :)

ring = a single round = this is the shared version in OSP

Post edited February 3, 2012 at 9:43 PM EST.

Attached File: coppertubeinsteadofring.png


http://weelookang.blogspot.sg


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