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Homework Statement
So I'm doing a problem set and the question refers to a coaxial cable, I am told that the cable consists of an inner solid cable radius (R1), which is surrounded by a outer thin tube with radius (R2) , both have the same current though them but opposite direction. I have to create equations for the magnetic field inside the inner cable, between the two, and outside the tube. The picture I am given is a filled in circle inside of a larger circle.
My questions about doing the problem are:
1. Should the thin tube be modeled as a solenoid? But then I don't know the number of turns
2. If I use Amperes Law, then wouldn't I get a I_through of zero?
Homework Equations
magnetic field inside a current carrying wire is =[(µIr)/2piR2]
The Attempt at a Solution
Honestly I don't even know where to start because I don't know how to model the outer circle
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