What is Coulomb’s Law?

Coulomb’s Law is the rule that tells us how hard electric charges push or pull on each other.

Imagine you have two magnets in your hands. If they snap together, it feels like a strong tug. Now imagine if one magnet was twice as big; the tug would feel even harder. Electric charges do something very similar, but instead of just getting stronger, their strength changes based on how far apart they are and how much "electric stuff" each one has.

Electric charges come in two types: positive and negative. Think of them like happy and grumpy neighbors. A positive charge and a negative charge love to be close, so they pull toward each other, just like a magnet sticking to a fridge door. But if you have two positive charges or two negative charges, they act like kids who don't want to share a toy; they push away from each other.

Here is the fun part: distance changes everything. If those two electric charges are standing right next to you, the force is super strong. But if one of them takes ten big steps backward, the force becomes much weaker, almost like hearing a shout turn into a whisper. Specifically, if you double the distance between them, the force doesn't just get half as strong; it gets four times weaker! This happens because the influence spreads out over more space, like ripples in a pond getting wider and flatter as they move away from the center.

So, Coulomb’s Law is simply counting how much charge there is and measuring how far apart they are to calculate that invisible tugging or pushing power. It explains why your hair stands up after rubbing a balloon, or why static electricity gives you a little zap when you touch a doorknob on a dry day.