Coulomb’s law

Last updated Unknown Edit Source

• Physics
• Electricity
• Law
• Electric force

calculates electric force

Electrostatic force

• directly prportional to the charges
  $$F_e\sim{~}Q_1\text{ , }F_e\sim{~}Q_2$$

Coulomb’s Law
$$F_e=k\cdot \frac{Q_1\cdot Q_2}{r^2}$$
$[k]=\frac{Nm^2}{C^2}$
$[N]=[k]\cdot \frac{C\cdot C}{m^2}$

$k=\frac{1}{4\pi \epsilon}$
$\epsilon$: permittivity of material

$k=9\cdot 10^9$$\frac{Nm^2}{C^2}$

$F_e$ is repulsive between like charges, attractive between unlike charges