00:01
And you have this figure showing an electron and a, this is the distance is 5 times 10 to negative 5 meter, and the velocity of the electron is 3 times 10 to 6 power meter per second, and theta between the direction and also the a is 68 degree.
00:18
So from there, you want to calculate at location and what are the direction of the electric and magnetic field contributed by the electron, and also the magnitude of the electric and magnetic field.
00:34
So from there, we know that electron is negatively charged.
00:42
So the electric field due to negative charge point towards the electron.
00:50
So if you ask about the direction of electric and magnetic field at a, the electric field vector points from a to electron.
01:09
This is the electric field direction.
01:16
Now for magnetic field, we would want to use right -hand rule for moving charges.
01:26
So from there, you can see if you use right -hand rule, your thumb is in the direction of electron velocity, which is upper right -right 68 degree.
01:38
And then you curl your finger towards point a, which is the right of the electron.
01:45
And then you can see the magnetic field due to a, it will be into the page.
02:17
B, magnitude of electric and magnetic field at a.
02:22
So first of all, let's say the electric field.
02:26
So e, electric field equals 1 divided by 4 pi multiplied by e0...