00:01
Now here this question, you have a electromagnetic wave, right? basically, a lot wave.
00:08
And it has a magnet field, which is directed on the x direction, right? so it's not really saying that it's not an x direction, but it seems that it's another x direction.
00:20
So let's, for example, take the, let's build up the coordinate system, right, like this.
00:29
And there are three directions space.
00:33
You know, you have the, i would like to take the magnet field going like this, okay? so this is a magnetic field and this is like two field.
00:40
And then this will be the direction of moving, direction of the wave, right? i'll call it k.
00:47
And then it's clear that if the magnet field is in this direction, right? and how do you get the electric field? you know, there's three directions, magnet field, electric field, and the propagation of the wave for my right -handed system.
01:01
So obviously the electro -ed wave is simply given by b cross -k, right? so that would be it.
01:11
So in other words, the e is in this direction, and it has the same amplitude as the magnet field, right? so you can easily write down the electricator.
01:19
So you can write down as 4, i think, and then sine k -y times omega -t...