How Is Proton Magnetic Moment Linked to Its Rotational Motion?

[Stellar1]

Homework Statement

Assume that the proton magnetic moment is to be interpreted as due to the rotational motion of a positive spherical uniform charge distribution of radius R spinning about its axis with angular speed w. Using classical relationship between the angular momentum and rotational speed show that:

wR^2 =5s/2m


2. The attempt at a solution

l = R*m*v = R*m*R*w = m*w*R^2

wR^2 = l/m

How is l related to 5s/2?

 

[Mindscrape]

I=2/5 mr^2 for a sphere and
L=Iw by definition so you can finish/restart the problem now...