00:01
Hello, here charged particle has a mass m, charge q and it's released from the rest in the region between two charged plates m and l.
00:15
After passing through the region of the electric field with accelerating voltage va, the particle enters another field of the magnetic field b, directed out of the page.
00:29
Let's make the sketch.
00:34
So here let's make the sketch.
00:36
First let's show the charge of l and m.
00:39
Here l is positively charged, m is negatively charged, that's why this particle q carries a positive charge.
00:47
In equation a we have to determine sign of the charge and that is positive sign.
00:55
Now let's move on to question b.
00:57
We have to find velocity as it enters the magnetic field.
01:03
Here m v squared over 2 equals to q va.
01:12
Then v is square root of 2q va over m.
01:19
Now let's determine direction of the magnetic force on the particle.
01:28
So here v is to the right and the field is out of the page.
01:37
Now we can use the left hand law to show the direction of the force.
01:43
This force is downwards, down the page...