8.03 - Lect 19 - Second Exam Review

[@alexandredemasure]

I got 60%, I find this topic very hard. I will keep studying !! I'm preparing to go back to univ next year, thanks a lot for all this content

[@santiagoarce5672]

I looked it up and the glass "sphere" at the end is an example of Helmholtz resonance. Look it up if you want to find out more about it.

[@js-fg6oc]

Hi Dr. Lewin, is (at 41.25) "rigid spaghetti" (electric field is moving in space at the same velocity as the charge which generates it) phenomenon direct result from Maxwell's equations?

[@lecturesbywalterlewin.they9259]

that was a very nice analogy. However, the E-fields move with the speed of light.

[@js-fg6oc]

Thank you Dr. Lewin for clarification. Or I was already contemplating that instantaneous communications would be possible with conservative electric fields. Could you, please, recommend a book and/or lectures on the subject of antenna current distributions and its corresponding radiation patterns? Thank you very much.

[@tomli3479]

Hi professor, Is the 61Hz for the question at the end of your lecture related to the Helmholtz frequency which I googled in web? Thank you!

[@lecturesbywalterlewin.they9259]

how many minutes into the lecture?

[@tomli3479]

around 1:19:00

[@lecturesbywalterlewin.they9259]

I do not remember what the res freq is. It can easily be calculated if you know the dimensions. use google

[@tomli3479]

thanks!

[@mohithmaruvada473]

Mr Lewin I am a student who completed high school and I am preparing for JEE exam. I want u to plz go through the JEE main exam previous year question papers and let us know that can we really pass JEE physics section with flying colours by referring to your lectures . Plz don’t misunderstand me I really respect you and your lectures which are a product of your hard work.I am a physics lover because of your lectures. Plz reply

[@pabloastoreca8726]

Less than 3% of your subscribers saw this video. WHAT'S THE REASON?

[@lecturesbywalterlewin.they9259]

most viewers watch 801 and 8.02. 8.03 is more difficult.

[@ahmedhosny4755]

the answer to the question at the end of the lecture, please!!

[@lecturesbywalterlewin.they9259]

it's up to you

[@ahmedhosny4755]

i can't handle it

[@lecturesbywalterlewin.they9259]

yes and no - use google