Falling Magnetic Field Line

[engrg1]

Have done a simple magnet falling (under free fall) and how the magnetic field lines move along with it.

In order to change the number of field lines, please edit the variable NField in the variables page.


Thank to Wolfgang Christian Magnetic Dipole Field 3D Model at http://www.opensourcephysics.org/document/ServeFile.cfm?ID=12361&DocID=3083
I have modified the magnetic field line codes so that the magnetic field lines are drawn at the start and it is not drawn dynamically.


Please press the reset button if you can't see the magnetic field lines.

Embed a running copy of this simulation
<applet code='users.sgeducation.engrg1.FallingMagnetFieldLine_pkg.FallingMagnetFieldLineApplet.class' archive='http://www.phy.ntnu.edu.tw/ntnujava/ejsuser/130498/ejs_FallingMagnetFieldLine.jar' name='FallingMagnetFieldLine9512' id='FallingMagnetFieldLine9512' width='600' height='600' mayscript=true><param name='draggable' value='true'></applet>
Embed a running copy link(show simulation in a popuped window)
<a href='http://www.phy.ntnu.edu.tw/ntnujava/msg.php?smfejs=9512' target='smfejs'>Run simulation</a>

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[lookang]

awesome!

area of improvement
can the lines are permanently drawn? i noticed the lines blink as it is redrawn every step.

[engrg1]

I am using Trail3D to plot the points.
Need to change the array to plot the moving magnetic field.

Seems can't really draw the lines peramanently

[lookang]

I saw the source code and you are using one trail to draw all the lines on one side.

http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=2564.0
Has An array to draw each lines seems pretty permanent to me.

Even more permanent is the analytical lines but loses some accuracy in the line plots.

Each method can some problem.
Array hangs the simulation sometimes especially when drag the view.
Analytical is not accurate but seems like the best thing moving forward, for the time being.