Hey, guys. In this video, we're going to be talking about how dielectrics work. Okay? The little nitty gritty stuff. Alright. Let's get to it. What a dielectric is specifically is it's an insulating material that has the ability to polarize. We talked about polarization a while ago when we were discussing how objects gain charge. Okay. On the left here, I have an insulator that's left alone. It has no external electric field. So all of those atoms, right, which are a positive and negative charge are oriented in all sorts of random directions. Okay? This is non-polarized. However, when I put this insulating material in an x electric field then the charges want to align themselves in a particular way. Okay? These negative charges want to move up the sorry, down the electric yeah. Up the electric field. It was right the first time. And these positive charges want to move down the electric field. So they all orient themselves in a specific way to align with the electric field. This is a polarized insulator. So an insulator that has the ability to polarize is a dielectric.
Now how do dielectrics affect capacitors? This is another thing that we want to look at at the atomic level. Consider the capacitor shown that has a small dielectric placed partially inside of it. What happens is in the vacuum, this capacitor produces 5 electric field lines. The thing is that the dielectric has charges, for instance negative charges that can absorb some of those field lines so they don't pass through the dielectric, and then positive charges that then produce those same field lines again. Okay? So inside the dielectric, the actual amount of electric field lines is reduced. Dielectrics reduce the electric field. We can see from this figure that there are only 2 electric field lines inside the dielectric. So in a vacuum, the electric field is going to be one value but inside the dielectric, it's always going to be less. Okay? This wraps up our discussion about how dielectrics work on the atomic level. Okay? All this nitty gritty stuff about dielectrics. Thanks for watching guys.
