a coaxial cable consists of an inner conducting wire and an outer conducting she

Question

a coaxial cable consists of an inner conducting wire and an outer conducting shell. Assume the space between the wire and the shell is empty space. The wire has radius of Rw and current of lw. The shells inner surface is Rs from the wire's center and shell's outer surface is 2Rs from the wire center . the shell is Rs thick. There is a current ls in the shel. Where (if it exists) is the magnetic field zero for the cases listed? a- lw=ls B- lw=-ls. C lw=-ls/2 a coaxial cable consists of an inner conducting wire and an outer conducting shell. Assume the space between the wire and the shell is empty space. The wire has radius of Rw and current of lw. The shells inner surface is Rs from the wire's center and shell's outer surface is 2Rs from the wire center . the shell is Rs thick. There is a current ls in the shel. Where (if it exists) is the magnetic field zero for the cases listed? a- lw=ls B- lw=-ls. C lw=-ls/2

Explanation / Answer

Applying the Ampere's law,

B.L = u0 Iinside

so B = 0 when Iinside = 0

for r > 2Rs

Iinside = 0   { current enclosed in this region }

Iw + Is = 0

Iw = - Is

Ans (B)

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