In my (though few) experiences, magnetic lines are always curved (with respect to a Euclidean plane). I have never seen there is any magnetic line that is Euclidean straight.
If there is a magnetic line that is Euclidean straight, could you please give me an example? If not, then the existence of a Euclidean straight magnetic line contradicts what physics theories?
Answer
Magnetic field lines are not straight because we have not found a mono magnetic pole yet. magnetic lines by a single pole can only be straight like electric field lines by a single positive charge or single negative charge. But unlike electric charge ,magnetic charge always found is pairs(as far as we know there exist only magnetic dipole). Thats why magnetic lines are not straight.
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