physics: the law of coulomb

Charles Augustin de Coulomb (1736-1806) is a French physicist. Inventor of Coulomb's law (1785), inventor of the balance punter (torque, 1777), a military engineer, inspector general of the education, and author. He was born in Augouleme, France, on June 14, 1736 and died in Paris on August 23, 1806 at the age of 70 years.
He was very famous because it can measure the electric force and magnetic force carefully. To honor his name immortalized as a unit of electrical charge, is couloumb (abbreviated C). One couloumb = amount of electric charge that flows through a conductor for one second, when the current one ampere.
Couloumb law reads as follows: "The attractive force or repulsive force two electrically charged objects is inversely proportional to the square of the distance and directly proportional to the respective charge". To measure the electrical force, using the balance sheet Couloumb punter or a very sensitive torsion balance.
Coulomb's law is
the force carried by the two objects (which msaing each electrically charged) were one and the other, a strong charge is proportional to the electric current of the object. The interaction between two charged objects whose geometry can be neglected dimension of the distance between the two. So in a fairly good approximation can be considered that the two charged objects such as a point charge.
The image shows two point charges Q1 and Q2 separated at a distance r. Coulomb's law states that the force on a charge electrostatics
Q1 Q2 due to the charge are:

Here r = r = xi + yj + zk: perpindahandari vector Q1 to Q2, so the style of electrostatics
the charge due to the charge Q1 Q2 is F1 =-F2
Obtained from experiments that:

F = k. q1. q2
r ²
in the MKS system:
F = magnitude of attraction or repulsion unit N
k = constant number comparator / constant unit Nm ² / C ²
r = distance between the two objects satuannyha m
q1. q2 = besaranya first object and a second unit C (coulomb)

In the CGS system:
F = units dyne
k = dyne cm ² / stc
r = cm
q = statcoulumb (stc)