# Field lines of a bar magnet not like electric dipole

It's mentioned that the magnetic field of a bar magnet don't start at one end or end at another (like what happens for a electric dipole), but rather passes "through" the bar magnet like the magnetic field generated by a current loop.

But the reason is not mentioned. Why this is true for a bar magnet and why electric dipole like field is not observed?

• Note that the correct spelling is "dipole", not "diapole". – Emilio Pisanty Oct 8 '18 at 14:01

Moreover, there are some important considerations which mean that finding even one magnetic dipole, in conjunction with quantum mechanics, would have strong consequences for the entire theory, and it would go a long way towards explaining some deep questions like "why does electric charge only ever come in multiples of one single elementary charge $$e$$?". Because of that, there has been a considerable amount of research time and money devoted to looking for magnetic monopoles.