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- 1 - Physics 2213 HW #6 — Answer Keys Fall 2008 21.96 [Half-Ring of Charge] 2kQ π a 2 ; downward . 22.8 [Gauss’s Law] (a) 2 452 N m /C. (b) 2 881 N m /C. - (c) 2 429 N m /C. - (d) 2 723 N m /C. (e) 2 158 N m /C. - (f ) No. 22.37 [Coaxial Cable] (a) a < r < b, E = 1 4 πε 0 2 λ r , radially outward. (b) r c, E = 1 4 πε 0 2 λ r , radially outward. (d) λ . 22.42 [Concentric Spherical Shells] (a) , 0, r a E < = 2 0 1 , , 4 q a r b E r πε < < = , b r c E < < = 0, 2 0 1 , . 4 q r c E r πε = (c) q . (d) + q . 22.54 [Slab of Charge] (b) 0 : x x d E ρ ε = . 0 : d x d E ρ ε = #1 [Hollow Cylinder of Charge] (b) E(r) = λ 2 π ε o r = σ R ε o r for r > R E(r) = 0 for
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