# Are the value of the magnetic field of a current carrying coil and the magnetic dipole moments of the involved electrons comparable?

The magentic dipole moment of electrons is a intrinsic property. To get the macroscopic effect of their common magnetic field this moments have to be aligned, like in permanent magnets or in current carrying coils. I'm wondering is it possible to compare the value of the magnetic field of a coil with the sum of the magnetic dipole moments of the involved electrons?

• Of course you can compare the two numbers. Will it make sense? Not in the regime in which we normally operate electromagnets. May 27 '16 at 11:54
• Right here " like in [...] current carrying coils." you are assuming your conclusion. May 27 '16 at 16:08

Dipole fields fall as $1/r^3$. The magnetic field due to a long linear current falls as $1/r$ near the wire.