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A long straight wire

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Scholar
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Date Posted: 7/2/2008 7:12:17 PM  Status: Closed
A long straight wire
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Question Details:
A long straight wire has fixed negative charge with a linear charge density of magnitude 3.6 nC/m. The wire is to be enclosed by a coaxial, thin-walled, nonconducting cylindrical shell of radius 2.0 cm. The shell is to have positive charge on its outside surface with a surface charge density that makes the net external electric field zero. Calculate .
C/m2
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Oracle
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Date Posted: 7/2/2008 9:14:49 PM  Status: Live
Asker's Rating: Lifesaver   
Response:
μ = 3.6 nC/m, r = 2.0 cm = 0.020 m
use Gauss theorem with a Gaussian surface: coaxial cylinder shell of radius R > r and length L
since E = 0 on the shell, the net charge inside the cylinder = 0
σ*2πr*L - μL = 0
∴σ = μ/(2πr) = 28.6 nC/m2
ela's Comment:
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