P24_021 - 2 (8 . 85 10 12 C 2 / N m 2 ) (8 . 10 2 m) = 4 ....

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21. We denote the inner and outer cylinders with subscripts i and o , respectively. (a) Since r i <r =4 . 0cm <r o , E ( r )= λ i 2 πε 0 r = 5 . 0 × 10 6 C / m 2 π (8 . 85 × 10 12 C 2 / N · m 2 )(4 . 0 × 10 2 m) =2 . 3 × 10 6 N / C . ~ E ( r ) points radially outward. (b) Since r>r o , E ( r )= λ i + λ o 2 πε 0 r = 5 . 0 × 10 6 C / m 7 . 0 × 10 6 C / m
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Unformatted text preview: 2 (8 . 85 10 12 C 2 / N m 2 ) (8 . 10 2 m) = 4 . 5 10 5 N / C , where the minus sign indicates that ~ E ( r ) points radially inward....
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