Coaxial cable.
The inner cable has a radius R1 and carries D, a current per cross
sectional area.
The outer cable is a sheath cable, very thin, and carries an equal
total current but in
the opposite direction at a radius R2. There is a spacer between
the two cables and a
rubber coating on the outside for safety purposes.
(Give answers in terms of R1, R2, D, and universal constants, plus
r only when specified)
a) Determine the total...