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AlanTuring

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(measured in Teslas) and called "magnetic flux density". This is often considered as the "strength" of the field (the magnitude of the vector at a given point of the vector field).I also read that one can consider that the strength of the magnetic field B

is proportional to the number of field lines in the region. With the vector field approach one would rather say that the vector at point (x,y,z)

in space have a given magnitude and that this magnitude is the "strenght" of the magnetic field.How can we put the 2 together? Can we say that there really is physically a certain number of field lines passing by a region of space?