00:01
Okay, in this problem, we have a mass spectrometer.
00:04
So we have a velocity selector here.
00:07
The particles come out of it with a known velocity, and then they follow this circle around.
00:14
We're told with, we're told the electric field and the velocity selector, the magnetic field everywhere, and the radius of the circle.
00:23
It actually gives it to us as diameter, so we have to divide by two to get the radius.
00:29
Okay.
00:29
So one of the first things we need is the velocity.
00:34
The velocity is the magnitude of the electric field, divide by the magnitude of the magnetic field.
00:45
And that comes out to be 8 .89 times 10 of the fourth meters per second.
00:58
Then we're moving in a circle.
01:01
We know what we have is mv squared over r, has to equal qvb for particles moving in a circle...