1) Consider the process of charging a pith ball by touching it to a charged rod.

ID: 2234061 • Letter: 1

Question

1) Consider the process of charging a pith ball by touching it to a charged rod. Considering the surface areas of the pith ball and the charged rod, as well as the imperfect transfer of charge, take a guess as to what fraction of the rod?s charge was transferred to the pith ball? 100%? 25% ? 1%? 0.0001%? 0%? 2) The electrostatic interaction seems to be relatively weak on macroscopic objects. On the pith ball there were only 10^9 extra electrons for about 10^22 atoms in the pith ball, or 1 charge per ten trillion atoms. That is why the force appeared weak. On molecular or atomic size scales, the electric charge determines everything because there is about one charge per atom. Estimate the force between a proton and an electron at the Bohr radius of 0.5

Explanation / Answer

1% F = 9*10^9 * 1.6*10^-19 * 1.6*10^-19 /(0.5*10^-10)^2 = 9.2*10^-8 N

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1) Consider the process of charging a pith ball by touching it to a charged rod.

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