a coaxial cable consists of athin center wire carrying current I_0 and a thin outer conductorcarrying net current I_0in the opposite direction. Half the spacebetween the conductors is filled with a material with permeabilityμ and the other half with air. Find A) B for r>a, B) H_air forr<a, C)H_mag,matirial for r<a, D)M_mag,matirial for r<a,where "a" is the radius of the cable
, surrounded by a concentric cylindrical tube of inner radius 
and outer radius 
. The conductors carry equal and opposite currents 
distributed uniformly across their cross-sections.
from the axis.
