Static Electricity According To Coulomb’s Law
The magnitude of the electrostatic force of attraction between two charges q and Q  placed at a distance r is given by the formula
Where,
F = magnitude of electrostatic force
ε0=Vacuum permittivity = 8.854 × 10−12 C2N-1m-2
k0 = Coulombs constant =1/4πε0
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