posted by abdul rahman .
A long coaxial cable consists of two concentric conductors. The inner conductor is a cylinder with radius R1, and it carries a current I0 uniformly distributed over its cross section. The outer conductor is a cylindrical shell with inner radius R2 and outer radius R3. It carries a current I0 that is also uniformly distributed over its cross section, and that is opposite in direction to the current of the inner conductor. Calculate the magnetic field B as a function of the distance R from the axis.
a)find magnitude of the magnetic field for 0 < r < R1
b)Find magnetic field for R1 < r < R2
c)find magnitude of the magnetic field for R2 < r < R3