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What is the force between two small char...

What is the force between two small charged of `2 xx 10^(-7)` C placed 30 cm apart in air?

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`F=(1)/(4piepsi_(0))(q_(1)q_(2))/(r^(2))`.
`9xx10^(9)xx(2xx10^(-7)xx2xx10^(-7))/((30xx10^(-2))^(2))`
`=4xx10^(-3)`N.
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XII BOARDS PREVIOUS YEAR-XII BOARDS-SET-I
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