What is the potential energy of the equal positive point charges of $1\,\mu C$ each held $1\, m$ apart in air
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(a) By using $U = 9 \times {10^9}\frac{{{Q_1}{Q_2}}}{r}$
$==>$ $U = 9 \times {10^9} \times \frac{{{{10}^{ - 6}} \times {{10}^{ - 6}}}}{1} = 9 \times {10^{ - 3}}\,J$
$==>$ $U = 9 \times {10^9} \times \frac{{{{10}^{ - 6}} \times {{10}^{ - 6}}}}{1} = 9 \times {10^{ - 3}}\,J$
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