00:01
If we want to look at the potential differences between different points of a charge configuration, we need to know how to do that.
00:10
So, for instance, i have a charge configuration here that is a rectangle with points a, b, c, and d.
00:19
At point a, there's no charge, but we want to know what the potential is from the charges at b, c, and d.
00:25
B has the plus 8 microculum charge, c has a negative 12 microculum charge.
00:30
And point b has a negative 8 micro -coolum charge.
00:35
So we also have our potential that is delta v equals k, which is coolum's constant times q over r.
00:51
In order to do that, i need to know distances between the different points.
00:57
So here, this side is going to be 0 .35 meters, and the shorter side is 0 .2 meters.
01:07
So what i want to do is add up the potentials from each of these three charges at point a.
01:15
So what i have for delta v total here is going to be delta v from point b on a plus delta v from point b on a plus delta v from point d on a plus delta v from point c on a.
01:44
In this case, the charges are going to need to be calculated individually because they all are different.
01:55
So i have for b on a, i have k, which is just a constant times q...