@21:32 "Can a particle exert a force on itself?" The answer "No" is given because the equation breaks down (or equivalently, a singularity occurs). That the equation breaks down doesn't mean that the _physics_ breaks down. The map is not the terrain. All we can say is that we don't know because our model is breaking down. Also, particles are not _point_ particles: they have some extent. The formula only applies to the field strength _outside_ the particle. What happens inside the particle we don't know but there is likely no singularity (that is, the field strength does not increase to infinity). The particle cannot be exerting a _net_ force on itself. @24:30 As you get closer and closer to the sphere the sphere appears to be flatter and flatter from your point of view (just as if you were standing on the surface of Earth). It then starts to resemble a flat plane. The field emanating from a place is vertical to the plane.
Thank you for these videos. I already had a horrible professor who never really taught before the shutdown, he completely abandoned us and left us on our own for the rest of the semester. Appreciate you.
In a rc circuit or simple resistance circuit when we closed key ( time t=0 ) we observes that initial current is V/R. But in RI (resistance-inductance) circuit when we switch on of circuit we see that there is zero current initially in wire. Why? No one answered my question in detail. You are my last hope. If possible make a short solution video to answer my question with detailed analysis.
Thank you very much for posting these videos! You are a great educator. One question though. Are the exercises and tests for this course available and if not which books would you recommend?
Thank you very much! We don't yet offer this as an online course, but we hope to in the future! We use the Matter & Interactions curriculum by Chabay and Sherwood.
The distance r is a bit confusing at the end. It seems that somewhere it says that the distance between the center of the dipole and the green point is r but it’s not on the slide, Which can explain the calculated distances. Maybe that distance was said but missing on the slide is 😕. Other than that 👏👏
Thanks for the fantastic lecture! 3 Questions: 1- Doesn't Newton's third law prohibit(not quite the right word) objects to exert force on themselves? At least when they are points.I exert F on myself and there should be a reaction F from myself to myself and they cancel out. 2-Does the diapol calculation mean that there is no electrically neutral object? If we consider a hydrogen atom as a turning diapol then it is not neutral, is there any neutral configuration of charges? I mean outside the configuration. 3- Wasn't the gravity vs electricity comparison a little unfair? Why a hydrogen atom? why not Sun and Earth? Any 10N force is equal to any other 10N force regardless of its cause. But I got your point about intuition, but it is a little like iron is heavier than cotton. Thanks again!
Objects can exert forces on themselves (think of a string on a guitar) but there must also be counteracting forces. The forces plus counteracting forces must (of course) net to zero.
let's imagine that the electron is affected by the field it generates..it will move in all directions, that is a nother meaning for rotation? maybe that what causes the electron to rotate around itself?
Great idea! But let's see what it means... if something rotates, it must rotate about a particular axis. That axis would then be pointing in a particular direction, which would break the spherical symmetry of the problem. So, by symmetry, the electron cannot be induced to rotate by its own field. It's a cool idea, though!
@@ProfessorCarlson You are a great interactor. Good on you for approaching answering questions the way you do. I appreciate it anyway, and I have to imagine others do, as well.
The sun and Earth are largely electrically neutral. If the sun were made only of positively charged particles and the Earth of positively charged then the 39 order of magnitude difference would still apply.
I totally love your excitement about the stuff you are teaching. This makes it 10^39 times more enjoyable. :)
one of the best videos i have seen. Looking forward to other lectures on this subject. subscribing to the channel right away. thumbs up
Wow, thanks! Glad you liked it.
@21:32 "Can a particle exert a force on itself?" The answer "No" is given because the equation breaks down (or equivalently, a singularity occurs). That the equation breaks down doesn't mean that the _physics_ breaks down. The map is not the terrain. All we can say is that we don't know because our model is breaking down. Also, particles are not _point_ particles: they have some extent. The formula only applies to the field strength _outside_ the particle. What happens inside the particle we don't know but there is likely no singularity (that is, the field strength does not increase to infinity). The particle cannot be exerting a _net_ force on itself.
@24:30 As you get closer and closer to the sphere the sphere appears to be flatter and flatter from your point of view (just as if you were standing on the surface of Earth). It then starts to resemble a flat plane. The field emanating from a place is vertical to the plane.
My thoughts exactly at @21:32. This is putting the cart before the horse.
Please make lectures on classical mechanics, your explanation is wonderful. You make physics easy to understand.
Thank you for these videos. I already had a horrible professor who never really taught before the shutdown, he completely abandoned us and left us on our own for the rest of the semester. Appreciate you.
prof please make lectures on classical mechanics ..... you are awesome
Excellent video as usual and the "Professor in Charge" at the end, pun intended? xD
In a rc circuit or simple resistance circuit when we closed key ( time t=0 ) we observes that initial current is V/R. But in RI (resistance-inductance) circuit when we switch on of circuit we see that there is zero current initially in wire. Why?
No one answered my question in detail.
You are my last hope.
If possible make a short solution video to answer my question with detailed analysis.
Thank you very much for posting these videos! You are a great educator. One question though. Are the exercises and tests for this course available and if not which books would you recommend?
Thank you very much! We don't yet offer this as an online course, but we hope to in the future! We use the Matter & Interactions curriculum by Chabay and Sherwood.
The distance r is a bit confusing at the end. It seems that somewhere it says that the distance between the center of the dipole and the green point is r but it’s not on the slide, Which can explain the calculated distances. Maybe that distance was said but missing on the slide is 😕. Other than that 👏👏
Thanks for the fantastic lecture! 3 Questions:
1- Doesn't Newton's third law prohibit(not quite the right word) objects to exert force on themselves? At least when they are points.I exert F on myself and there should be a reaction F from myself to myself and they cancel out.
2-Does the diapol calculation mean that there is no electrically neutral object? If we consider a hydrogen atom as a turning diapol then it is not neutral, is there any neutral configuration of charges? I mean outside the configuration.
3- Wasn't the gravity vs electricity comparison a little unfair? Why a hydrogen atom? why not Sun and Earth? Any 10N force is equal to any other 10N force regardless of its cause. But I got your point about intuition, but it is a little like iron is heavier than cotton.
Thanks again!
Electric Universe google it you should find it fasinating
Objects can exert forces on themselves (think of a string on a guitar) but there must also be counteracting forces. The forces plus counteracting forces must (of course) net to zero.
let's imagine that the electron is affected by the field it generates..it will move in all directions, that is a nother meaning for rotation? maybe that what causes the electron to rotate around itself?
Great idea! But let's see what it means... if something rotates, it must rotate about a particular axis. That axis would then be pointing in a particular direction, which would break the spherical symmetry of the problem. So, by symmetry, the electron cannot be induced to rotate by its own field. It's a cool idea, though!
@@ProfessorCarlson You are a great interactor. Good on you for approaching answering questions the way you do. I appreciate it anyway, and I have to imagine others do, as well.
I wished I was in your class
i would answer that it depends on the mass and size, electricity wins on small stuff, gravity on large objects.
The sun and Earth are largely electrically neutral. If the sun were made only of positively charged particles and the Earth of positively charged then the 39 order of magnitude difference would still apply.
FLUFFY!!!!🐰
She should have clarified the rules of the fight before the vote...
Ribbit 💀