Reference Designer Calculators



Coloumb's Law


The electrostatic force between the two charged points is directly proportional to the product of these charges and inversely proportional to the square of the distance between them.Coulumbs law equation is accurate description of force between objects whenever object act as a charge. The value of constant depends on the medium. In case of air it is 9x109Nm2/c2.In water it is reduced by factor 80.



F = k*(q1*q2)/r2


First charge in uC
Second Charge in uC
Distance in meters
  Force in Newtons