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## Homework Statement

1)I have a doubt regarding the sign of g factor value.

In Wikipedia the g-factors are given as:

Orbital g-factor

Mu(L) = g(L)[Mu(B)L]/h_bar

Where g(L)=-1 is the orbital g factor

Spin g-factor

Mu(S) = g(S)[Mu(B)S]/h_bar

Where g(S)=-2 is the spin g factor

Lande g-factor

Mu(J) = g(J)[Mu(B)J]/h_bar

Where g(J) is the spin g factor

But in my book it is given as follows:

Orbital g-factor

Mu(L) = -g(L)[Mu(B)L]/h_bar

Where g(L)=1 is the orbital g factor

Spin g-factor

Mu(S) = -g(S)[Mu(B)S]/h_bar

Where g(S)=2 is the spin g factor

Lande g-factor

Mu(J) = g(J)[Mu(B)J]/h_bar

Where g(J) is the spin g factor

Which is correct? Is the g factor positive or negative? Also, in Wikipedia it is given that the g-factor value for electrons, neutrons and muon is negative while it is positive for protons. I think they mean spin g-factor here.