Question

Write down Coulomb’s law in vector form and mention what each term represents.

Answer 1

The force on the point charge q₂ exerted by another point charge q₁

`vec"F"_21 = ("K""q"_1"q"_2)/"r"^2  hat"r"_12`

where `hat"r"_2` is the unit vector directed from charge q₁ to charge q₂, and ‘K’ is the proportionality constant K = `1/(4 pi ε_0)`; ε₀ is the permittivity of free space.