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If the flow of current follows in the direction the index finger is pointing, then the the magnetic field lines will flow in the direction the middle finger is pointing, the thumb points in the direction that the force is exerted.
If the flow of current follows in the direction the index finger is pointing, then the the magnetic field lines will flow in the direction the middle finger is pointing, the thumb points in the direction that the force is exerted.
https://youtu.be/ySx84Ca7BFQ