1

00:00:00,720 --> 00:00:01,500

Welcome back.



2

00:00:01,530 --> 00:00:08,640

So now you know about the state of the art knowledge and the early theories of electrodynamics, so



3

00:00:08,640 --> 00:00:14,460

you have seen that there are some concepts that already made sense even before the Maxwell's equations



4

00:00:14,460 --> 00:00:15,400

were formulated.



5

00:00:15,870 --> 00:00:20,850

For example, there was quite a good knowledge about charges and there was quite a good knowledge about



6

00:00:20,850 --> 00:00:21,420

magnets.



7

00:00:21,420 --> 00:00:24,860

And we had already understood some concepts like the Cullum's law.



8

00:00:25,620 --> 00:00:31,530

However, we had also seen that, for example, the impasse law is not really correct, that there is



9

00:00:31,530 --> 00:00:35,190

a term missing because it violates the continuity equation.



10

00:00:36,270 --> 00:00:41,210

So now we will come to one of the most important sections of this whole course.



11

00:00:41,220 --> 00:00:47,790

I would say it's the most important section because here I will straight up introduce to you the Maxwell's



12

00:00:47,790 --> 00:00:48,510

equations.



13

00:00:49,530 --> 00:00:55,050

So in the first lecture, I will just give you these equations, I will just write them down, as Maxwell



14

00:00:55,050 --> 00:01:01,450

did, and the truth is, it's not really possible to derive these equations.



15

00:01:02,730 --> 00:01:08,230

However, I will follow up with a lecture about a motivation for these equations.



16

00:01:08,250 --> 00:01:15,150

So we will use symmetry arguments and we will at least make it reasonable that the Maxwell equations



17

00:01:15,150 --> 00:01:16,470

look like they look.



18

00:01:17,930 --> 00:01:25,280

So once we have these maximal equations, we will, of course, discuss them and I will also derive



19

00:01:25,430 --> 00:01:28,310

the integral version of the Maxwell equations.



20

00:01:29,090 --> 00:01:34,940

And then later in this course, you will see that the Maxwell equations are really the basis of all



21

00:01:34,940 --> 00:01:41,570

of electrodynamics, and you can use them to derive basically every phenomenon with within electrodynamics.



22

00:01:42,710 --> 00:01:48,980

However, we need also a fifth law, which is the Lawrence force, so we will also discuss to Lawrence



23

00:01:48,980 --> 00:01:50,400

Force in this lecture.



24

00:01:51,290 --> 00:01:52,850

So I hope you're still motivated.



25

00:01:52,910 --> 00:01:55,910

Let's go ahead and start the discussion of the Maxwell equation.