Four years ago my dad and I watched your lectures together. Today I'm near the end of my journey with physics (in academic terms). You do make us love physics!
Professor, I'm currently taking a class in electromagnetism and we're learning Maxwell's equations in multiple forms. In terms of E, in terms of D, etc. What would you say are the fundamental forms of Maxwell's equations to commit to memory? From which the other variations can be derived.
@@lecturesbywalterlewin.they9259 professor if E or B has a negative sign infront of it ; then there should be a phase difference of pi between E and B while the wave moving in -y . So shouldn't B and E be out of phase?
@@aritramondal4010 question unclear - you will have to refer to how many minutes into the lecture. *I can already assure you that what I did in the lecture is correct.*
10:15 ,why do we need to change the sign inside the cosine , isn't it that , just taking account of E * B would change the direction of propagation ??? i am confused please help
@@lecturesbywalterlewin.they9259 Sir we know that energy is a scaler quantity then why in the concept of poynting vector, energy is treated as a vector quantity
Sir, what happens if we only change the signs inside the cosine part of B and E and leave the outer signs intact? What difference does it create physically in the wave? I have seen the comments but my confusion is still there.
Since cos(-Q) is cosQ so no impact on wave but inner cos terms are phase terms so if u change those thing than wave can start from anywhere i.e. from origin from pie/4 or pie/2 or pue/8 this is the effect when we change terms inside cos otherwise wave property will still remain same but changing the value if u say like w inside cos than it is angular frequency so wavelengths can change but amplitude will still remain same
Lectures by Walter Lewin. They will make you ♥ Physics. Thankyou sir. During admissions at MIT its asked that "why you want to join MIT" So I want to ask you that why you joined MIT proff?
