Thursday, June 10, 2010
Ejs Open Source Bar Magnet & Compass Model with Earth visualization java applet « on: September 24, 2009, 04:38:59 AM » posted from:Fiesso D\'artico,Veneto,Italy
« on: September 24, 2009, 04:38:59 AM » posted from:Fiesso D\'artico,Veneto,Italy
Magnetic Bar Field Model to rename to Ejs Open Source Bar Magnet & Compass Model with Earth visualization java applet as request by one of the authors.
written by Wolfgang Christian, Francisco Esquembre, and Anne Cox remixed now by lookang Smiley
special thanks to Fu-Kwun Hwang for mentoring this learning community.
This now has great features, thanks to Wolfgang Christian, Francisco Esquembre, and Anne Cox for sharing their original applet, special thanks to Fu-Kwun Hwang for mentoring this learning community, support the development of this new and improved Ejs Open Source Bar Magnet & Compass Model with Earth visualization java applet.
This material is re-released under the GNU General Public License Version 3. http://www.gnu.org/licenses/gpl.html as legally required by the original authors.
This work is licensed under a Creative Commons Attribution 3.0
O level Syllabus
draw the magnetic field pattern around a bar magnet and between the poles of two bar magnets
describe the plotting of magnetic field lines with a compass
Magnetic Bar Field Model
The EJS Magnetic Bar Field Model shows the field of a bar magnet and has a movable compass that reports the magnetic field values. The bar magnet model is built by placing a group of magnetic dipoles along the bar magnet. Users can examine and edit the model if Ejs is installed.
1. Run the simulation. Move the compass around in the magnetic field of the magnet. Move the magnet around. What is the relation between the compass and the field vector (small arrows)?
2. Test to see how well you can use the compass to determine the location of the magnet: Click on the Randomize position check box and then push the Hide Field button. Use the compass to show the direction of the magnetic field and then move the marker (same size as the magnet) to where you think the magnet is located. Click on Show Field to see if you were correct. If you were, describe your strategy. If you weren't, explain what went wrong and try again.
3. The model uses a group of magnetic dipoles to build a model of a bar magnet. If you have Ejs installed, examine the model and determine how many dipoles are stacked together (and in what configuration) to create a model of a bar magnet.
* Giancoli, Physics for Scientists and Engineers, 4th edition, Chapter 27 (2008).
Ejs Open Source Bar Magnet & Compass Model with Earth visualization java applet was created remixed now by lookang based on an earlier Magnetic Bar Field Model by Wolfgang Christian and Francisco Esquembre and modified by Anne J Cox using the Easy Java Simulations (EJS) authoring and modeling tool. Exercises written by Anne J Cox.
You can examine and modify a compiled EJS model if you run the program by double clicking on the model's jar file. Right-click within the running program and select "Open EJS Model" from the pop-up menu to copy the model's XML description into EJS. You must, of course, have EJS installed on your computer.
Information about EJS is available at: and in the OSP ComPADRE collection .
Learning Goals : Students will be able to http://phet.colorado.edu/en/contributions/view/2826
YouTube. Was stuck at Portland airport from 11pm to 4am, decided to use the time to make some promotional video on the applets shared during 2010 AAPT Summer Meeting in Portland, Oregon