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Information about this web site => Request for physics Simulations => Topic started by: lookang on June 14, 2009, 11:39:57 am



Title: Charge Distribution of 2 objects
Post by: lookang on June 14, 2009, 11:39:57 am
An insulated uncharged metal object M is brought near but not touching and insulated positively charged metal sphere S.
Which of the following diagrams best illustrates the final distribution of charges on S    and on M?


I thought this is an applet not made yet on this forum.

for your consideration ;D


Title: Re: Charge Distribution of 2 objects
Post by: Fu-Kwun Hwang on June 14, 2009, 01:34:54 pm
Please check out JaCoB (http://www.phy.ntnu.edu.tw/demolab/CoLoS/JaCob/).
Click Electricity at the right frame, then click Two cylinders.
May be it is what you want. There are a lots of possibility with JaCoB.
The following is a demo. You can also check out Image charge: point cgarge and a sphere (http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=319.0)

http://www.phy.ntnu.edu.tw/ntnujava/swf/jacob.swf

The following is a JaCoB applet. Move your mouse inside  and right click for menu to generate objects, charges ...etc.
-*-


Check out attached image!

Download jacob.zip and open Jacob.htm with your browser.


Title: Re: Charge Distribution of 2 objects
Post by: lookang on June 14, 2009, 06:05:22 pm
Simply awesome!

Thanks!, JaCoB applet is the best for this purpose for students to try to figure out themselves.

I managed to follow your video to get the same effect setup as in the question.
http://www.phy.ntnu.edu.tw/demolab/CoLoS/JaCob/
I have to make a video about this when time permits. It is super powerful

The embedded applet appears to be of a different character system? i see squares for the english words :)


Title: Re: Charge Distribution of 2 objects
Post by: lookang on June 14, 2009, 06:11:51 pm
Another thing to note is after clicking the examples, the files are not found, perhaps need to upload the html files?
http://www.phy.ntnu.edu.tw/demolab/CoLoS/JaCob/
Electricity

   1. Cylinder near conductive corner
   2. Electrometer
   3. Actin and Myosin
   4. Cylinder
   5. Rectangle
   6. Two cylinders
   7. Two rectangles
   8. Franklin experiment - I
   9. Franklin experiment - II
  10. Electric shadow
  11. Dipole in electric field
  12. Insulator in electric field
  13. Friction electricity
  14. Semiconductor and PN junction
  15. Capacitor and generator
  16. Concentric cable
  17. Lightening rode
  18. Plate capacitor and dipole
  19. Cylindrical capacitor and insulator
  20. Van de Graaff accelerator
  21. Cylinder, el. charge  and grounding
  22. Biological cell ionic channel (under construction)
  23. Acolos



Not Found

The requested URL /demolab/CoLoS/JaCob/expel/evogal.html was not found on this server.
Apache/2.2.11 (Debian) PHP/5.2.6-3 with Suhosin-Patch Server at www.phy.ntnu.edu.tw Port 80


Title: Re: Charge Distribution of 2 objects
Post by: Fu-Kwun Hwang on June 14, 2009, 09:32:21 pm
Sorry! It was due to Lowercase/Uppercase filename problem.
It is fixed now. Please let me know if you found more problems. Thanks!


Title: Re: Charge Distribution of 2 objects
Post by: lookang on June 14, 2009, 09:46:21 pm
the 2 problems still there ;D

The Electricity cases are not viewable
Not Found

The requested URL /demolab/CoLoS/JaCob/expel/evogal.html was not found on this server.
Apache/2.2.11 (Debian) PHP/5.2.6-3 with Suhosin-Patch Server at www.phy.ntnu.edu.tw Port 80

and the embedded applet in the post above show squares
[eye]
(http://www.phy.ntnu.edu.tw/ntnujava/index.php?action=dlattach;topic=1139.0;attach=1128;image)
[/eye]


Title: Re: Charge Distribution of 2 objects
Post by: Fu-Kwun Hwang on June 14, 2009, 10:06:58 pm
It seems that you were viewing the cached html page.
The URL has been changed to EVogal.html
You might need to reload the page.

English should be the default code for applet. I will check out what might cause the problem.

The file was link to a Chines version jar. I changed the above tag to iframe. It should display english version now.


Title: Re: Charge Distribution of 2 objects
Post by: lookang on June 15, 2009, 07:54:35 am
fantastic Stuff!

thanks! This is amazing, Good Job Prof. Hwang.



Title: Re: Charge Distribution of 2 objects
Post by: lookang on June 20, 2009, 07:24:45 pm
Hi prof, i read that http://www.phy.ntnu.edu.tw/demolab/CoLoS/JaCob/GNUgpl.htm

//==============================================================================
//
// Copyright (C) 2000 Vojko Valencic
// Savin Zlobec
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
//
//==============================================================================

i am interested create a download-able jacob applet for education purpose, it is possible to zip it as an attachment?

thanks!

btw it seems http://www.phy.ntnu.edu.tw/ntnujava/index.php have the only working copy of jacob in the free internet space.
http://webphysics.davidson.edu/applets/jacob/intro.html is not working properly.


Title: Re: Charge Distribution of 2 objects
Post by: Fu-Kwun Hwang on June 20, 2009, 09:24:29 pm
Jacob was developed by Vojko (a good friend of mine who pass away several years ago) and other co-workers. Vojko was also a member of CoLoS (http://colos.org/) group.

The Jacob web page is located at http://www.phy.ntnu.edu.tw/demolab/CoLoS/JaCob/
You will find that Jacob need jacob.jar  (from the source of the html page)
So you should be able to download it from http://www.phy.ntnu.edu.tw/demolab/CoLoS/JaCob/jacob.jar

All the jacob are controled by javascript. You can copy it from the html page.
 


Title: Re: Charge Distribution of 2 objects
Post by: lookang on June 21, 2009, 10:00:16 pm
i saved the html from internet explorer 8
i download jacob.jar too.

but it had some errors

i followed the error message and download extra files

lang.data
property.data

into the data folder

but it still not working.

i zip it for u to test?
think still missing some files?


Title: Re: Charge Distribution of 2 objects
Post by: Fu-Kwun Hwang on June 21, 2009, 11:01:47 pm
I just added ui.data under data subdirectory and it work for my firefox.
I also found scriptmanual.pdf (it is attached,too)

Complete zip file has been upload at the second post.


Title: Re: Charge Distribution of 2 objects
Post by: lookang on June 21, 2009, 11:55:28 pm
In memory of Vojko Valencic, i have created the zip file to be shared as the way he licensed it.
http://www.phy.ntnu.edu.tw/demolab/CoLoS/JaCob/

//==============================================================================
//
// Copyright (C) 2000 Vojko Valencic
// Savin Zlobec
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.


Title: Re: Charge Distribution of 2 objects
Post by: UKLN8860 on November 22, 2009, 06:21:23 pm
 :D