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Q. Proton is nearly $1836$ times more massive than the electron. The Coulomb force of repulsion between two protons separated by a finite distance is $F$. The electrostátic force between two electrons separated by the same distance is

Electric Charges and Fields

Solution:

Force between protons $F=\frac{K(+e)(+e)}{r^{2}}$
Force between electrons $F^{\prime}=\frac{K(-e)(-e)}{r^{2}}=\frac{K e^{2}}{r^{2}}$
$\Rightarrow F^{\prime}=F$