A penny made of copper, mass = 3.11 g, Atomic weight 63.5 g, find total no of positive and
negative charges and the force between them if these are separated by 1 m, Atomic # of
Cu = 29 ( Avogadro's # = 6.02 x 1023) [Hint Find mass in moles, find no of atoms, each atom
has 29 p and 29 e, find total charge and apply Coulomb’s law]
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