# Magnetic field in the ground state of hydrogen

What is the magnitude of the B field produced by the electron's orbital motion in H1, according to classical model? I found all sorts of values, I myself calculated 1/8 T, using the standard formula, but I suppose it is not exact.

What is QM response on the issue? Since in that theory the electron has no defined orbit I imagine it cannot produce a magnetic field. Can you explain what is the QM explanation of the spin-orbit interaction and what is the presumed / measured value of the B field in the ground state, is it zero?

$$\mu = g\mu_B\sqrt{s(s+1) }$$
So when the electron and proton spins are aligned the magnetic moment is $2\sqrt{2}\mu_B$ while when the spins are anti-aligned it is zero.