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Give me a standpoint and I will move the earth. ...Archimedes (287-212BC)

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 Author Topic: Charge Distribution of 2 objects  (Read 16690 times) 0 Members and 1 Guest are viewing this topic. Click to toggle author information(expand message area).
lookang
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 « Embed this message 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.

 charge distribution.PNG (50.62 KB, 978x1167 - viewed 574 times.) Logged
Fu-Kwun Hwang
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 « Embed this message Reply #1 on: June 14, 2009, 01:34:54 pm » posted from:Taipei,T\'ai-pei,Taiwan

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.ã€€Move your mouse inside and right click for menu to generate objects, charges ...etc.
-*-

Check out attached image!

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lookang
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 « Embed this message 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/

The embedded applet appears to be of a different character system? i see squares for the english words
 bug.PNG (9.24 KB, 715x486 - viewed 1122 times.) Logged
lookang
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 « Embed this message 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
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

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 560 times.) « Last Edit: June 14, 2009, 06:15:14 pm by lookang » Logged
Fu-Kwun Hwang
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 « Embed this message 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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lookang
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 « Embed this message Reply #5 on: June 14, 2009, 09:46:21 pm » posted from:Singapore,,Singapore

the 2 problems still there

The Electricity cases are not viewable

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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 « Embed this message 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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lookang
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 « Embed this message 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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lookang
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 « Embed this message 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
//
// 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
Fu-Kwun Hwang
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 « Embed this message 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)

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

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lookang
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 « Embed this message Reply #10 on: June 21, 2009, 10:00:16 pm » posted from:Singapore,,Singapore

i saved the html from internet explorer 8

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?
 *** There are 1 more attached files. You need to login to acces it! « Last Edit: June 21, 2009, 10:01:47 pm by lookang » Logged
Fu-Kwun Hwang
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 « Embed this message 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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lookang
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 « Embed this message 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
//
// 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.
 *** There are 1 more attached files. You need to login to acces it! Logged
UKLN8860

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

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Give me a standpoint and I will move the earth. ...Archimedes (287-212BC)