17.10.Set Up:Like charges repel and unlike charges attract.Solve: (a)The force is attractive so the unknown charge is positive.(b)The unknown charge exerts a downward force of 0.200 N on the other charge.17.11.Set Up:The electrical force is given by Coulomb’s law, with A proton hascharge and an electron has charge Solve: (a)Yes, this force is about 52 lbs.(b)The force is smaller than in part (a) by a factor ofso it isNo, this force isvery small.17.12.Set Up:One mole of carbon contains Each electron has charge If charge is removed from the sphere, the sphere is left with a charge of Solve: (a)The number of moles is The number of atoms is Each atom has 6 electrons, so the number ofelectrons is Each electron has charge so the total negative charge of the elec-trons is (b)The sphere would be left with positive charge The force would have magnitudeThis is an immense force. Thecharges are opposite sign so the force is attractive.
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