NO time to change yet.
For the attached simulation, I notice that the potential is labelled as V.
Can you change it to the 'phi' symbol for all?
[color=blue][b]done using [/b][/color][code]math_failure (math_unknown_error): \\phi
Also can I suggest that the g field strength arrow/s appear automatically
when the g button is clicked and M1 or/and M2 is clicked?
Instead of having to check the box on top of the g field strength bars (on
the right of the screen).
What happen now is that the students may have unchecked the g button but
the g arrows are still around because they have not unchecked the box on
top of the g field strength bars.