00:01
Hi there, so for this problem, we are told that in 1897, j .j.
00:08
Thompson discovered the electron by measuring the chore to mass ratio of catoed rates.
00:16
So, as follows.
00:19
First, he passed the beam through uniform cross -electric and magnetic fields, mutually perpendicular, and both of them perpendicular to the beam.
00:30
And adjusted the electric fuel until he got zero deflection.
00:37
So the question in here is what then was the speed of the particles? so with that information, we know that the force is equaled in this case to the charge of the particle times.
01:00
Well, let's just write it in vector form.
01:03
So this is going to be the electric field.
01:07
And this, sorry, the electric field and this plus the magnetic force.
01:15
And we know that the magnetic force is the cross product between the speed and the electric field...