37. The net charge carried by John whose mass ismis roughlyq=(0.0001)mNAZeM0.0001)(90 kg)(6.02×1023molecules/mol)(18 electron proton pairs/molecule)(1.6×10−19C)0.018 kg/mol=8.7×105C,and the net charge carried by Mary is half of that. So the electrostatic force between them is estimated
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