Examples of using Vector field in English and their translations into Hebrew
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Let's define a vector field.
Let's see what this vector field looks like, and let's see if that gives us-- if our intuition holds in this example.
So let's say I have a vector field.
So the divergence of that vector field, is just a partial derivative of this with respect to x.
Let's say I have the vector field v.
So let's say that I have a vector field f, and we're going to think about what this means in a second.
And remember what our vector field was.
And then when it's here, maybe the vector field is like that, but it moves in that direction, because it's on some type of tracks.
And that's why it's called a vector field.
Now, this is called a vector field, so it probably makes a.
So we're done analyzing this vector field.
So even though a vector field has all these vectors on it, the divergence tells you an actual scalar number at any point in the field. .
Now define a vector field by.
Or I gave you a scalar field and you got a vector field.
A field line is a locus that is defined by a vector field and a starting location within the field. .
So div of v is thesame thing as our del operator dot our vector field, v.
So when the particle is right here, maybe the vector field acting on it, maybe it's putting a force like that.
And actually, this is called an irrotational--I think that's the word-- vector field.
So if I had an infinitesimally small circle, or sphere, in this vector field, I would have no net density increasing.
One thing to immediately realize, even before we work on the intuition,is when we did gradient I gave you a surface and it gave us a vector field.
That we just have an expression that if you give me a point anywhere in this vector field, I can tell you the divergence at that point.
This would be a path independent vector field, or we call that a conservative vector field, if this thing is equal to the same integral over a different path that has the same end point.
So the curl, at any point of this vector field, is 2.
So if I said that I had, I don't know,let's say, my vector field is cosine of yi plus-- so it's interesting; my x-direction is dependent on my y-coordinate--plus, I don't know.
It's always fun to just interpret a vector field to death.
And let's say this vector field, just for the purposes of visualization it could be anything, but let's say it represents the velocity of particles of fluid of any point in two dimensions.
If you took the dot product of this,which is this upside down triangle, with this vector field, what would you get?
What I want to do in this video is establish a reasonably powerful condition in which we can establish that at vector field, or that a line integral of a vector field is path independent.
Well, I think it's clear, you know,right when you look at it, that this vector field looks like it's spinning.