ampere law as an applet? what is there to simulate?

anyway, i found this, could be a good start
http://webphysics.davidson.edu/physlet_resources/bu_semester2/c15_ampere.html

Ampere's Law allows us to easily calculate magnetic fields in highly symmetric situations, much as Gauss' Law allowed us to determine electric fields.

Ampere's Law states that the line integral of B ds around a closed (i.e., complete) loop is proportional to the current passing through the loop: