field lines defines the strength of the magnetic field act as a boundary but why is there direction of field - Physics - Magnetic Effects of Current

Question

field lines defines the strength of the magnetic field act as a
boundary but why is there direction of field lines from n to s Pls
answer

Vaibhav T. · Accepted Answer

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field lines defines the strength of the magnetic field act as a boundary but why is there direction of field lines from n to s.Pls answer