The direction of magnetic induction can be determined using the right hand rule or using the gimbal rule.
Right hand rule: If you grasp the conductor with your right hand so that the protruding thumb points the direction of the current, then the other fingers will show the direction of the magnetic induction lines of the field created by this current, which envelop the conductor, and therefore the direction of the magnetic induction vector, directed everywhere tangentially to these lines …
If the direction of the translational movement of the gimbal (screw) coincides with the direction of the current in the conductor, then the direction of rotation of the gimbal handle coincides with the direction of the magnetic induction vector of the field created by this current.
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