how do make the magnet turn orientation to NS from current SN?

[lookang]

Hi Prof,

how do make the magnet turn orientation to NS from current SN?

I was tinkering the codes here.

I was looking for a way to understand the codes i was unsuccessful to isolate the codes responsible for the magnetic dipoles bearing currently it is SN ( left to right)

If i can locate the codes, i can proceed to make the changes!

thx!

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[lookang]

not to worry!
got it

Code:

  xField[i][j] = -b[0];
  yField[i][j] = -b[1];

instead of

Code:

  xField[i][j] = b[0];
  yField[i][j] = b[1];

finally by trial and error. LOL