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**1. Homework Statement**

A particle of charge q and rest mass m0 moves in a circular orbit of radius R and angular frequency w in a uniform magnetic field b in the z direction: Find b in terms of R,q , m0, and w.

**2. Homework Equations**

b = (1/c) v X e and v = w/R and e = not sure. My problem is that all of my equations for e have a gamma factor (lorentz factor) in them, and I don't think i need that. So I think I am using the wrong equations.

**3. The Attempt at a Solution**

I got that v = w/R

and if I do indeed use gamma i have gamma(u) = (1-w^2R^2/c^2)^-(1/2)