00:01
Okay, so we have two charged objects that are a distance of r away from each other.
00:08
So here's our distance calling r, and that is 0 .31 micrometers.
00:20
So we'll want this in meters, so we can just say 0 .31 times 10 to the negative 6 meters, since micrometers is 10 to the negative 6.
00:32
And these are two, they have two different charges, so we'll call that q1, which we know, is 4 .3 times 10 to the negative 5 coulooms.
00:47
And then we have q2, which we don't know, and we'll need to solve for.
00:52
And there is a force between them equal to 7 newtons.
00:57
So the electric force is given by the constant k times q1 times q2 divided by the distance between them squared...