Calculate the minimum electrostatic force between two charged particles separated at a distance of 1 cm in air.

Explanation

As we know that, the minimum charge is an electronic
charge, i.e. `e=1.6 xx 10^(-19)C`
Also given, `r = 1cm =10^(-2)m`
So, minimum electrostatic force is the force between two electrons or between an electron and a proton.
`:. F=(kq_(1)q_(2))/(r^(2)) rArr F=(e^(2)k)/(r^(2))`
`rArr F=((1.6xx10^(-19))^(2))/((10^(-2))^(2)) xx 9xx10^(9)`
`=(2.56 xx 9 xx 10^(9) xx 10^(-38))/(10^(-4))`
`:.F_("min")=23.04 xx 10^(-25)N`