00:01
Hello students, in this question we have a couple of images giving the direction, force, the magnetic field and the velocity.
00:10
So this is regulated by the equation f is equal to b, b cross v cross b or we can say it's q times v cross b, right? this is the direction.
00:24
Okay, so v cross b is the direction of this thing.
00:29
So here, let's look at the first image.
00:32
So the direction of magnetic field is in this direction and the force is in this direction and the velocity is going inside.
00:44
So is it validated? so we can use the right handed rule.
00:49
So right handed rule we can use.
00:52
Using the right handed rule, you can see that the direction of three has to be in this direction, right? this is the right handed rule.
01:01
So it should be the force should be in the direction of v cross b.
01:04
So v is to the inside and b is to this direction.
01:09
So v cross b, v cross b has to be swept across.
01:17
So the force has to be in the direction opposite to this.
01:23
Okay, so it has to be in this direction.
01:25
So this violates, this violates the rule.
01:30
So this is not valid...