Like charges repel and unlike charges attract. Based on this, Coulomb’s law of electrostatic force came into being. The law states that, ‘The electrostatic force of attraction or repulsion FC between two point charges is directly proportional to the product of the charges and inversely proportional to the square of their distance apart.’
Mathematically,
FC∝Q1Q2r2FC=kQ1Q2r2
Where k=14πϵ0
Hence, FC=Q1Q24πϵ0r2
Where ϵ0=8.85×10−12F/m
and k=9×109Nm2/C2
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