Coulomb force
[tex]\tt F=k\dfrac{q_1.q_2}{r^2}[/tex]
F = coulomb force (N)
Q1,Q2 = the charge (C)
r = distance between two charges (m)
k = constant = 9.10⁹ Nm² / C²
Input the value:
[tex]\tt F=9.10^9\dfrac{0.00368\times 0.00059}{0.4^2}=122130~N[/tex]
