# Why does the electron have a magnetic moment?

Hi.

I thought magnetic moment arose from closed loops of charge currents. How does then the angular momentum of the electron produce a magnetic moment? I mean, the electron is not a loop.

Am I wrong in my initial assumption or am I understanding things too "classically"?

Thanks.

Meir Achuz
Homework Helper
Gold Member
You are thinking too classically. The electron's magnetic moment arises from the relativistic QM Dirac equation for the electron.

1 person
dextercioby
Homework Helper
You don't need Dirac's equation to derive the magnetic moment of the electron. Pauli's nonrelativistic equation will suffice.

1 person
I see. Then saying that the magnetic moment arises from its rotation and its charge is just oversimplifying things, right?

Meir Achuz