74. (a) Let E= σ/2ε0= 3 ×106N/C. With σ= |q|/A, this leads to qRR ER Ek====×××=×−⋅−ππ202222697222 510301010101022σε....mN C2 8.99CN mCch chdi(b) Setting up a simple proportionality (with the areas), the number of atoms is estimated to be N=××
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