Moving Magnet Model

The EJS Moving Magnet Model shows a magnet moving near a conducting loop and the current that is induced in the loop. Users can examine and edit the model if Ejs is installed. Information about EJS is available at: <http://www.um.es/fem/Ejs/> and in the OSP ComPADRE collection <http://www.compadre.org/OSP/>.

Questions:

Run the simulation. You can click-drag in the the window to rotate the view and shift-click to zoom in and out. As the magnet oscillates back and forth, you can see the induced current direction (red or yellow). Explain what you see and determine which end of the magnet is the North pole (blue or pink)?
Click on the oscillate check box so that you can drag the magnet yourself (it will stay on a line through the center of the loop). Use Faraday's law to explain what happens to the current when you don't drag it as well as when you do.

References:

Giancoli, Physics for Scientists and Engineers, 4th edition, Chapter 29 (2008).

Credits:

The Moving Magnet Model was created by Anne J Cox using the Easy Java Simulations (EJS) authoring and modeling tool.

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: <http://www.um.es/fem/Ejs/> and in the OSP ComPADRE collection <http://www.compadre.org/OSP/>.