ch22_p74 - 74. (a) Let E = /20 = 3 106 N/C. With = |q|/A,...

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74. (a) Let E = σ /2 ε 0 = 3 × 10 6 N/C. With = | q |/ A , this leads to qR R E RE k == = = ×× × ππ 2 0 2 2 2 2 6 9 7 2 2 2 5 10 30 10 10 10 10 2 2 σε .. mN C 2 8.99 C Nm C c h c h di (b) Setting up a simple proportionality (with the areas), the number of atoms is estimated to be N = ×
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