Not got how they made diagram

Dear student,
In the diagram, point A and B represent the wire carrying current.
Now from distance 'd' from A and B is the point where vectors has been drawn.
BA is the direction magnetic field due to wire A and that is perpendicular to the line joinig A.
BB is the direction magnetic field due to wire B and that is perpendicular to the line joinig B.
BR is resultant magnetic field due to both the wire.

Hope the diagram is clear now!
Regards

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