trying the make a 2 magnet model.

still debugging

1. working from an earlier model i remixed into http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=1582.0
2. removed some stuff
3  added the ability to Lon and Ron thanks to Prof Hwang's code http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=1602.msg6216#msg6216
4 added a scale on the right side of the applet for aid visualization
5 change the number of xField and yField to 41 instead to allow a zoom of 2
6 got the BField to work correctly by adding  Prof Hwang's code http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=1602.msg6216#msg6216
7 adding the |B| , Bx , By, angle to the display
8 debugging to get it to work beautifully

challenges:
getting getB to work for inside the magnets which i conceptualize to saturate to 225 arbitrarily following the Phet numbers

still the applet will hang when the compass moves on drag.


challenges:
the compass reading, inside magnet, decide whether overlap magnets how?