Engineer Physics/Force/Electrostatic force

Electrostatic force is discovered by Coulomb in anf therefore is called Coulomb's force .

$F_{Q}=K{\frac {Q_{+}Q_{-}}{r^{2}}}$

From above,

$r=K{\frac {Q_{+}Q_{-}}{F_{Q}}}$

When $Q_{+}=Q_{-}$

$F_{Q}=K{\frac {Q^{2}}{r^{2}}}$

$E_{Q}={\frac {F_{Q}}{Q}}=K{\frac {Q}{r^{2}}}$

$W_{Q}=\int Edr=\int K{\frac {Q}{r^{2}}}dr=K{\frac {Q}{r}}$

$U_{Q}={\frac {W_{Q}}{t}}=K{\frac {Q}{rt}}$