00:03
So in this problem, we will have three charges at points on an equilateral triangle, each of side length 3 .28 centimeters.
00:22
So we know that all the interior angles are at 60 degrees.
00:26
And we are also told that there is a charge of four microculems that feels a downward force of 242 newtons.
00:40
And now we're answering the question.
00:45
What exactly is qa and qb? and in order to figure that out, we can see that just geometrically, the force from qb on the four microculum charge will extend in this direction.
01:04
And the force from the qa charge on the four -culem charge, will extend in this direction.
01:11
So it makes sense that the force, the 242 newtons, is coming from the vertical component of the angle from qa and qb.
01:25
So therefore, we know that qa has to equal qb.
01:30
If that were not true, let's assume that qa and qb were not the same, then this force could not be downward...