74. (a) Let E= σ/2ε0= 3 ×106N/C. With = |q|/A, this leads to qRREREk====×××=×−⋅−ππ202222697222 5 1030 101010 1022σε..mNC2 8.99CNmCchchdi(b) Setting up a simple proportionality (with the areas), the number of atoms is estimated to be N=×
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