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Emf formula magnetic flux6/30/2023 ![]() It in future videos, this is the essence of Faraday's Law. And so this whole idea ofĪ change in magnetic flux inducing a current, this is the essence and we'll go deeper into To increase even more, that also would induce, that also would induce the current. If you were able to stretch it out so that the actual area increases which would cause the flux in the out of the screen direction Stretch it so it contains, so the actual area increases. If you increased its, if you would increase. The area of this actual loop if somehow it was made out of some maybe stretchy, stretchy wire somehow. Now there's other ways to change the flux. Side and you moved it that way, it would also induce a current but now since the flux is lessening in the outward direction, the current would go in the other way. Now if you moved it the other way, if it was on the left hand So, if you move it that way, you also would have a current like this. So there'll be more flux through this area here. Because if I move this to the left, the magnetic field is denser, I guess it's stronger And if I were to move it that way, the flux going through this surface or I guess coming out of Of changing the field, I could actually move my coil. The flux in some way, I am going to induce a current. The current isn't going toīe there if the thing is, if the magnetic field is stationary and I'm not changing this loop in any way. But the key here is when I change the flux through this surface defined by this wire, it's going to induce a current. Magnetic field were inwards, then the current would If I were to lessen the magnetic field in the outward direction or another way, if the change in the That causes the current to flow and there's other ways toĬhange the magnetic flux. And that is because thatĬhange in the magnetic flux that induces a voltage, an electromotive force thatĬauses this current to flow. It's going to go in a clockwiseĭirection around this. Will induce is going to go, is going to go in that direction and let me draw it a little bit clearer. It is actually going to induce a current. I guess you could say that these things became even denser So I don't know, a good way to, just gonna get even stronger Were to get even stronger in the outward direction. In the magnetic field, the change in the flux So, I guess one way to think about it is if I were to, if the change If I were to make it even stronger in the direction pointing Now the magnetic field is pointing out of the screen. But I will be able to induce a current if I change the magnetic flux going through this surface in some way. But if I just have this wire stationary in the magnetic field, nothing is going to happen. With the term magnetic flux, I encourage you to watch It's in this magnetic field and the magnetic field isn't changing, I do have some flux going through the, I guess you can say the If I just throw that loop of wire and if it's just stationary, Let's say I have a loop of wire that is, this is my loop of wire. But now let's do a loop of, let's do a loop of wire. Pointing out over here than we would over here. Now if we did it with vectors we would have bigger arrows Right hand side over here than they are on the left hand side, or at least that's what So the magnetic field is less strong on the If you got to the right here, they are less dense and ![]() And when you're using field lines, it's the density of the field lines tell you how strong the magnetic field is. You could show magneticįield lines like this, you could also use vectors. You, towards the viewer so you could view theseĪs the tips of the arrow. ![]() They don't look like lines because they're all This right over here, all right, this is my attemptedĭrawing a magnetic field and these are the magnetic field lines. Now we're going to see how this actually induces a current in that loop. We're gonna be going from a change, change in, and actually we're How a change in a magnetic field can affect or induce aĬurrent in a loop of wire. Talk about in this video is how we can go the other way. Videos, we talk about how a current flowing through a wire can induce a magnetic field. ![]()
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