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Easy Java Simulations (2001- ) => Simulations from other web sites => Topic started by: ahmedelshfie on April 25, 2010, 11:19:27 pm



Title: Ejs Open Source Bar Magnet Model java applet
Post by: ahmedelshfie on April 25, 2010, 11:19:27 pm
Magnetic Bar Field Model to rename to Bar Magnet Model as request by one of the authors.
written by Wolfgang Christian, Francisco Esquembre, and Anne Cox remixed
Edit by Prof lookang ,Modified interface by Ahmed
For more information you are welcome to visit :
http://www.compadre.org/osp/document/ServeFile.cfm?ID=9414&DocID=1310#Doc1310
how make loop for array for y coordinates (http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=1582.msg6046;topicseen#msg6046)
Ejs Open Source Bar Magnet Model java applet (http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=1210.0)


Title: Re: Ejs Open Source Bar Magnet Model java applet
Post by: ahmedelshfie on April 26, 2010, 06:45:39 am
A permanent magnet is an object made from a material that is magnetized and creates its own persistent magnetic field. An everyday example is a refrigerator magnet used to hold notes on a refrigerator door. Materials that can be magnetized, which are also the ones that are strongly attracted to a magnet, are called ferromagnetic (or ferrimagnetic). These include iron, nickel, cobalt, some rare earth metals and some of their alloys (e.g., Alnico), and some naturally occurring minerals such as lodestone. Although ferromagnetic (and ferrimagnetic) materials are the only ones attracted to a magnet strongly enough to be commonly considered magnetic, all other substances respond weakly to a magnetic field, by one of several other types of magnetism.

Some ferromagnetic materials can be magnetised by a magnetic field but do not tend to remain magnetised when the field is removed; these are termed soft. Permanent magnets are made from magnetically hard ferromagnetic materials that stay magnetized.

An electromagnet is made from a coil of wire which acts as a magnet when an electric current passes through it, but stops being a magnet when the current stops. Often an electromagnet is wrapped around a core of ferromagnetic material like steel, which enhances the magnetic field produced by the coil.

The overall strength of a magnet is measured by its magnetic moment, while the local strength of the magnetism in a material is measured by its magnetization.
Data and images from  http://en.wikipedia.org/wiki/Magnet


Title: Re: Ejs Open Source Bar Magnet Model java applet
Post by: ahmedelshfie on April 26, 2010, 07:48:35 pm
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.
You can modify this simulation if you have Ejs installed by right-clicking within the plot and selecting "Open Ejs Model" from the pop-up menu item.