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Consider a coin of Example 1.20. It is electrically neutral and contains equal amounts of positive and negative charge of magnitude 34.8 kC. Suppose that these equal charges were concentrated in two point charges separated by (i) 1 cm , (ii) 100 m ( \sim length of a long building), and (iii) 106 m (radius of the earth). Find the force on each such point charge in each of the three cases. What do you conclude from these results?

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a)\: \: F1=\frac{\left | q \right |^{2}}{4\pi \varepsilon _0{r_{1}}^{2}}= 1.09\times 10^{23}N

b)\: \: F2=\frac{\left | q \right |^{2}}{4\pi \varepsilon _0{r_{2}}^{2}}= 1.09\times 10^{15}N

c)\: \: F3=\frac{\left | q \right |^{2}}{4\pi \varepsilon _0{r_{3}}^{2}}= 1.09\times 10^{7}N

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