Chapter-1|Electric Charges and Fields | NCERT 12th Physics:
Coulomb’s Law in Vector Form:
We consider two positive charges q₁ and q₂ are placed in vacuum at a distance r from each other. They repel to each other.
According to Coulomb’s law the magnitude of force on charge q₁ due to q₂ is given by
On comparing equation (I) and (II)
F₁₂ = – F₂₁
From above Coulomb’s law agrees with Newton’s third law.