[Antennas] Current Flow in Coax?

[Paul Ferguson]

I was doing some reading about currents in coax. Tom, W8JI, has a lot of 
information on his Website. 

In 
http://www.w8ji.com/coaxial_line_and_shielded_wires.htm
Tom discusses skin-effect and that "If we feed exactly equal and opposite 
currents into the coax ends, currents have no choice but to flow INSIDE the 
cable shield."  

He also says, "the magnetic and electric fields from the center conductor 
"pull" all current to the inside of the shield."

I understand this must be the case to cancel radiation from the coax, but can 
someone point me to a technical explanation of how the forces operate to "pull" 
the current to the inside of the shield? 

73,
Paul
K5ESW