Coulomb's Law

In 1784 Ta french physicist name Charles-Augustin De Coulomb introduce a brain frying law that students now days don't understand What The Heck!!! it is. Well this dude introduce Coulomb Law about how electric charge behave with a equation. Well dummies, if you have Einstein like brain you can easily understand this law, So let's look at Coulomb's law!!

Electric charge comes from transfer charges between two materials like  rubbing a cotton cloth with a iron rod. What happen is the the cotton cloth will positively charge and the rod will negatively charge. When Charles-Augustin De Coulomb observe this charges is :

Same electric charge repel and different electric charge attract. Like a magnet!!

Come on guys we already know about this electric charging behavior. But He use mathematical equation to predict how electric charge attract and repel. Well you are right now scratching your head how to understand??!! It's easy my fellow dummies.

The picture above shown is a Coulomb Torsion Balance. What the Heck this machine does??!! This machine is used to attract and repel the charge ball to determine how much force is applied to make the charge ball attract and repel. This how the machine works. Now a ball is positively charge. When the positively charge ball is place in the machine, the ball in insulation rod will attract the if the ball in insulating rod is negatively charge. If positively charged, it will repel. This repel and attract movement is calculate by the coulomb's equation is : 

To calculate the force made by this charge balls. Not the ball you think!!! :P I mean volley ball. So k is the constant electric force. The Q represent of electric charges in the balls and divide by the distance 'R²' So the coulomb guy says :


The force between two point charges is 

1. directly proportional to the magnitude of each charge (q₁, q₂),
2. inversely proportional to square of the separation between their centers (r),
3. directed along the separation vector connecting their centers (r̂).

 

 YOU KNOW WHAT THE CONSTANT ELECTRIC FORCE IS 9.0 x 10⁹ N.

:)