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Author Topic: Charge Distribution of 2 objects  (Read 14062 times)
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lookang
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on: June 14, 2009, 11:39:57 am » posted from:Singapore,,Singapore

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 Grin


* charge distribution.PNG (50.62 KB, 978x1167 - viewed 388 times.)
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Fu-Kwun Hwang
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Reply #1 on: June 14, 2009, 01:34:54 pm » posted from:Taipei,T\'ai-pei,Taiwan

Please check out 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/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.


* jacob.gif (6.36 KB, 669x525 - viewed 354 times.)

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lookang
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Reply #2 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 Smiley


* bug.PNG (9.24 KB, 715x486 - viewed 884 times.)
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lookang
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Reply #3 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


* 01.PNG (11.64 KB, 312x504 - viewed 369 times.)
« Last Edit: June 14, 2009, 06:15:14 pm by lookang » Logged
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Reply #4 on: June 14, 2009, 09:32:21 pm » posted from:Taipei,T\'ai-pei,Taiwan

Sorry! It was due to Lowercase/Uppercase filename problem.
It is fixed now. Please let me know if you found more problems. Thanks!
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Reply #5 on: June 14, 2009, 09:46:21 pm » posted from:Singapore,,Singapore

the 2 problems still there Grin

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


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Fu-Kwun Hwang
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Reply #6 on: June 14, 2009, 10:06:58 pm » posted from:Taipei,T\'ai-pei,Taiwan

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.
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Reply #7 on: June 15, 2009, 07:54:35 am » posted from:SINGAPORE,SINGAPORE,SINGAPORE

fantastic Stuff!

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

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Reply #8 on: June 20, 2009, 07:24:45 pm » posted from:Singapore,,Singapore

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.
« Last Edit: June 20, 2009, 07:29:32 pm by lookang » Logged
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Reply #9 on: June 20, 2009, 09:24:29 pm » posted from:Taipei,T\'ai-pei,Taiwan

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 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.
 
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Reply #10 on: June 21, 2009, 10:00:16 pm » posted from:Singapore,,Singapore

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?


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« Last Edit: June 21, 2009, 10:01:47 pm by lookang » Logged
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Reply #11 on: June 21, 2009, 11:01:47 pm » posted from:Taipei,T\'ai-pei,Taiwan

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.


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Reply #12 on: June 21, 2009, 11:55:28 pm » posted from:Singapore,,Singapore

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.


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Reply #13 on: November 22, 2009, 06:21:23 pm » posted from:Bangkok,Krung Thep,Thailand

 Cheesy
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