Lec 2 | MIT 8.02 Electricity and Magnetism, Spring 2002

By | November 8, 2015

Electric Field Field Lines Superposition Inductive Charging Dipoles Induced Dipoles View the complete course: ocw.mit.edu License: Creative Commons BY-NC-SA More information at ocw.mit.edu More courses at ocw.mit.edu

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25 thoughts on “Lec 2 | MIT 8.02 Electricity and Magnetism, Spring 2002

  1. dorood

    this guy is worth every penny of tuition money

  2. iamdonalduck

    actually the trick is: ressonance
    he just has to hold firmly and put in an good angle.
    i do it a lot for fun xD

  3. koviack

    damn did u see how fast he drew that dotted line out with chalk? fucker has some skills

  4. JanColdwater

    Oh I am glad that is not my assignment! LOL

  5. ultmtsnwbrdr

    probably the most useless subtitles i’ve ever seen

  6. nit323

    I hope i made sense about the whole trajectory of the charge thing that I asked about…Please let me kno, if any of you can explain this….Thanks!!
    PS:Thank you MIT for such BRILLIANT material..
    And THANK YOU Prof.Walter Lewin for making these things sooo interesting and simplified:)!!!You are THE best Physics Prof. EVER!!!I wish i could some day sit IN ur class for real…Be a part of it rather than virtually watch genius in action:)

  7. nit323

    Correction from previous comment:Perception of a “field”…:)

  8. nit323

    I thot field lines were our perception of a file…If thats the case then how do we classify them as “curved” or “straight”?I mean if the field lines are an indication of the direction of the field,as we see it…then dont we also decide how the field lines should look?Also y is it so hard to find out the trajectory of the charged particle…Wouldnt its locus be the same as the family of curves of the field lines?Unless of course the field lines are are not “symmetric” or “concentric”.Pls help.

  9. lifematch

    man his writing is sooo sick!! man i have never seen anyone with such skills with a chalk.

  10. brianmenendez

    I’m not affiliated with MIT at all, but if you feel like you’ve benefited from this free MIT video, you can donate $ to MIT opencourseware. Donate as much as you appreciate and value these kinds of free educational courses which i personally love too…I’m just busting all of your balls :) do whatever you want

  11. msTINTINjoy

    i wonder what textbook they use…?

    i use the Young and Freedman University Physics Volume 2 12th Edition
    GREAT BOOK! better than my professor, surprisingly!

  12. msTINTINjoy

    @sonutulsiani nothing because the electric force of both charges will just cancel out…. also if the distance between them is so far it could be insignificant because the radius is inversely proportional to the electric force.

  13. jstafuckinusername

    What he means is when it is far away, the two charges can be considered one charge, and together become a +2. Or can be assumed to be so. But only far away. He had implied his earlier example was not that great since it was not far enough. It’s like a helium atom missing an electron. It will have the affect of a positive ion.

  14. md65000

    God this makes me wish I could go back and become a full-time student again! In fact if I could go back and be 21 again that would be nice too.

  15. Scurmicurv

    He talks specifically about dipoles at about 23:00.

  16. Compact3

    It will act like a bi-pool, which if you are far away, looks like it’s 0 I guess.

  17. sonutulsiani

    Ok I have a question. After watching the +3 and -1 charges, +3 is the hair dryer and -1 is vacuum cleaner. And so +3 blows out and -1 sucks in but the effect is not as much as of +3.

    What if both are +3 and -3? I mean if a charge is places far away, what will happen to it?

  18. luzzie9

    @abillionhearts4U The reading becomes large because both parts are now positive and like charges repel.

  19. DarkTrunksGeorgeSim


    Don’t be late, that means you pretty boy!
    I’m intrigued as to what this was meant for.

  20. abillionhearts4U

    At 33 minutes.
    When he does the electroscope experiment with the POSITIVELY charged ball; shouldn’t the reading become smaller, because the electrons stream down? After he creates the dipole, he takes the POSITIVE ball, not the NEGATIVE. Because he takes the POSITIVE ball, all the electrons in the electroscope should attract, stream down, and therefore the aluminum foil(?) should come closer, not separate even more, No?

  21. electrosquid1

    Thats what I thought but thanks for pointing it out.Walter Lewin is definitely an inspiring person,I think his lectures are great…Im in my third year of electrical engineering and his lectures have really helped me with some confusing concepts.check out the madras polytechnical institute on youtube.punch in for example ” lecture 4 Some useful laws in basic electronics ” and have a look around, Ive found some good lectures there..Its a bit challenging to understand the indian english though!

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