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Ghassan_2k
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Homework Statement
A coaxial cable of length l, has a thin wall cylindrical inner conductor of radius a carrying current I. All current returns along the outer conductor whose inner radius is b.
Assuming that the current flows only in a thin layer on each conductor, determine the magnitude and direction of the magnetic induction B at radius r.
a) when r<a
b) when a<r<b
c) when r>b
Homework Equations
[tex]\oint(B.dl) = \mu0 I[/tex]
The Attempt at a Solution
Ive just started studying magnetostatics and am a little bit confused. I think using Ampere's Law in each of the three cases is the right thing to do, but I am unsure on what the value for I is in each case.
For part a), i think B * 2 * pi * r = [tex]\mu[/tex]0 * I
but then i don't know how it differs for part b).
Thanks for any help