Larmor Precession: Understand Charge Orbitting Fixed Charge

[bman!!]

i'm familiar with terminology used to denote rates of change in inertial and rotational frames, and the equation that links the two quantities, but working through a derivation/thought experiment to describe charge orbitting around another fixed charge in a weak magnetic field, it results in precession which is analagous to gyrscopic precession, but for the life of me, when working through the derivation, i can't explicitly see which term in the final equation describes this precession.

could someone point me in the right direction

cheers

p.s
the equation I am looking at (it may be the wrong one) is:

ma(I) = k r + Qv(I) x B

where
m=mass
a(I) = acceleration vector in inertial frame
k = coulomb attaraction betwwen the charges, -QQ/4piepislon etc
r = radius
Q=charge
V(I) = velocity in inertial
B = mag field

 

[BigJDubs]

The term that is describing the precession is the cross product, Qv(I) x B. This term represents the Lorentz force, which is the force applied to the charge due to the interaction between the magnetic field and the charge. The Lorentz force causes the charge to precess around the fixed charge.