made the magnet as 10 individual magnets instead of the original single magnetic dipole
made variable magnetZ as slider that controls the model, it was not easy, cant recall what i did now.
magnetLength as slider
position 10 magnets across the magnetLength equally spaced
variable coilZ as slider that controls the model
add current and individual current to debug a problem with original codes that cause a unusual spike in the tension = voltage.
redo the voltage and seems to be okay now
time to sleep. 1 am
got workshop later :) at 8 am
made the ball freeFallZ = magnetZ[n/2-1]; // match centre of magnet
made n = 30 for smoother graph
found this great activity by Pasco