P23_062 - 62. (a) Let E = /20 = 3 106 N/C. With = |q |/A,...

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62. (a) Let E = σ/ 2 ε 0 =3 × 10 6 N / C. With σ = | q | /A , this leads to | q | = πR 2 σ =2 πε 0 R 2 E = R 2 E 2 k = ( 2 . 5 × 10 2 m ) 2 ( 3 . 0 × 10 6 N / C ) 2 ( 8 . 99 × 10 9 N · m 2 C 2 ) =1 . 0 × 10 7 C . (b) Setting up a simple proportionality (with the areas), the number of atoms is estimated to be N = π (2 . 5 × 10 2 m) 2 0 . 015
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