This is fantastic applet, it will add to your collection of good simulations for physics learners.

two questions,

1. how can i automatically plot the magnetic field lines?
for example, http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=740.0 [img]http://www.phy.ntnu.edu.tw/ntnujava/index.php?action=dlattach;topic=740.0;attach=1065;image[/img]


2.i changed the dt from 0.5 to 2 but it looks rougher (less accurate). how to make the drawing of magnetic field lines faster n still accurate?


i edited your applet and i notice a bug, changed it for u already. it is posted here and i think i will start a new post on it here http://www.phy.ntnu.edu.tw/ntnujava/index.php?board=28.0

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