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Get ContourPlot of wire (magnetic field)


Badly need some help.

I am drwaing magnetic field of star  (3 wires in angle 120=B0 among
them, they stich in point (0,0)).
I got equations with Biot-Savart for each wire, but how to make plot
in just specific part.

So how to write to get just ContourPlot of f=f(x,y) for x>0 ? Because
there is no field of it in left part of plane...

And then i would sum plots for all wires, once i settle that problem.

Any suggestion ?


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