00:01
Okay, the magnetic field acting on a charge gives rise to a force in what direction? well, let's write our definition.
00:13
Magnetic force is equal to the charge times the velocity crossed with the magnetic field, which means the force is perpendicular to the velocity, which is perpendicular to the field.
00:32
So they're all perpendicular.
00:35
So it's perpendicular to see the velocity and the magnetic field.
00:44
Okay, if you have a beam of electrons moving to the right, what is the magnetic force if we have a field into the page and out of the page? so let's just imagine, we'll just look at one charge, right? it's moving to the right, and we'll use the right -hand rule.
01:04
So the force is your thumb.
01:09
It's a positive charge so we don't have to switch any signs...