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im not very familiar with electromagnetic fields and classical physics, so i turn to you for help,

a problem:

assume you have a magnetic dipole in center (0,0) of a xy plane,

i want to plot the vector of the field at an arbitary point on this plane,and to plot the filedlines, how do i do this? which formulas describe the magnetic field/fieldlines?

thankyou verymuch

ahxbshe