2.0 Coulomb’s Law

  Magnetism and Matter

The force of interaction acting between two magnetic poles is directly proportional to the product of their pole strengths and inversely proportional to the square of the distance between them. $$F = \frac{{{\mu _o}}}{{4\pi }}.\frac{{{m_1}{m_2}}}{{{r^2}}}$$ where,

$m_1,$ $m_2=$ Pole strengths,

$r=$ distance between poles and

${{\mu _o}}=$ permeability of free space.