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

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