[quote author=Fu-Kwun Hwang link=topic=912.msg3429#msg3429 date=1233480760]
This simulation shows a current loop in uniform magnetic field.The magnetic field in in the +Z direction if Bz>0.
[/quote]
1. Add vector field arrow(s) for vector Bz .


[quote author=Fu-Kwun Hwang link=topic=912.msg3429#msg3429 date=1233480760]
Because the current flow in the same counter-clockwise direction.
[/quote]

2. Add  arrow(s) line along the sides of the wires to aid visualization of I current and q current flow.
\vec{F}= q \vec{v} \times \vec{B} or \vec{F}= I \int d\vec{\ell} \times \vec{B}


3. in the electron objects, can draw a negative sign -, to make it immediately association to electrons?

indeed  nice applets :)
can split posts into 2 separate applets for ease of discussion/collaboration etc.

thanks!