00:02
So along a straight line, we have two charges, a charge q and a charge 2q.
00:08
And they're both positive.
00:11
And there's this point p that is a distance d away from the 1q charge and a distance 2d from the 2q charge.
00:19
And we want to know what the electric field at point p is.
00:23
Now remember, electric field doesn't just have magnitude, it has direction.
00:27
So you have to consider that.
00:29
So let's take a look at how we're going to get the electric field.
00:33
It's the coulomb constant times the charge.
00:37
I'm going to put prime, so we don't mix it up with these cues, divided by the distance you are from that charge.
00:45
And when there's more than one charge, it adds vectorially, so you just sort of stack them up on each other.
00:53
So let's look at it piece by piece.
00:58
Let's look at how much of an electric field is coming from the two -q charged to p.
01:02
Let's do the two -que charge...