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MIT 8.02 Physics II: Electricity and Magnetism - Spring 2002

Lecture 3: Electric Flux, Gauss's Law, Examples

author:Walter H. G. Lewin, Center for Future Civic Media
published: Oct. 10, 2008, recorded: February 2002, views: 2020

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Description

"Today we're going to work on a whole new concept and that is the concept of electric flux. We've come a long way. We started out with Coulomb's law. We got electric field lines. And now we have electric flux.

Suppose I have an electric field which is like so and I bring in that electric field a surface, an open surface like a handkerchief or a piece of paper. And so here it is. Something like that. And I carve this surface up in very small surface elements, each with size DA, that's the area, teeny weeny little area, and let this be the normal, N roof, the normal on that surface.

So now the local electric field say at that location would be for instance this. It's a vector..."

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Reviews and comments:

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1 Abhishek Kumar, December 31, 2008 at 8:22 a.m.:

thats a great video thanks sir

Comment

2 mohamed, February 24, 2009 at 6:34 p.m.:

thanks professor for this great work..i am a student at engineering faculty (Egypt)..
i am asking if there anyone with whom we can share the knowledge about physics??

Comment

3 gina sucayan, July 22, 2009 at 4:32 p.m.:

can i ask for help?
can u answer this questions for me?

"Surface charge densities of 200,-50 and psxµC/m2 are located at r=3,5, and 7 cm respectively. find D at r=4cm? find psx if D=0 at r=7.32 cm?

thanks. ill wait for response. i'll just find it hard to solve.

Comment

4 Mukesh Dhnadia, July 25, 2009 at 12:47 p.m.:

It's Superb. Not any comments or not a sigle word to describe this lecture.

It's wonderful and too much effective.

Comment

5 Rajendra Kumar Agrawal, September 25, 2009 at 6:02 p.m.:

Respected Sir,

Professors like you inspire us to live Physics,breathe Physics.Your lecture make us believe-"Physics is beautiful".

regards

R.K.Agrawal

Comment

6 SunZhou, September 26, 2009 at 10:56 a.m.:

Thank you sir,that's a really good lecture.
I'm a student at material engineering in China,I want to know if there's some websites we can share our knowledge about Physics. Thank you.

Comment

7 AWAIS MUNIR, November 4, 2009 at 3:29 p.m.:

I, student of class inter, am realy very impressed to respected sir WALTER g.h lewin because of his carismatic work in the field modern physics. His guidence is very use ful for students of all over the world, who are interested in the modern physics

Comment

8 BRIJMOHAN, November 30, 2009 at 6:05 p.m.:

sir,

Comment

9 Kevin M., December 28, 2009 at 11:20 p.m.:

I'm a junior mechanical engineering major. Having taken this class as a freshman, I now realize why MIT is so selective and expensive. I'm taken aback at the amount of content this course covers per lecture, the gift Dr. Lewin has for teaching, and the things I'm learning as I watch.

By putting these lectures on the Internet, MIT is giving the world an invaluable gift.

Comment

10 reuben, March 8, 2010 at 11:41 a.m.:

thanks for that lecture professor.am a student at kenyatta university.

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