Geometric Mean Radius of Hollow Conductor

[sandy.bridge]

Homework Statement

GMR_{hollow cylinder}=Re^{-Kμ} where K=\frac{AR^4-R^2r^2+Br^4+r^4ln(R/r)}{(R^2-r^2)^2}, where R is the outer radius and r is the inner radius, and mu is the relative permeability. We are to determine the numerical values of A and B.

I am stumped on how to begin attempting this question. Any hints or help would be greatly appreciated.

 

[sandy.bridge]

Figured it out thanks.

 

[iRabbit5]

Hey, we have the same question and were wondering how you did this?
Thanks