Electric field energy density

[@rogerramber7627]

thats a smooth professor

[@ΓΙΑΝΝΗΣ-ΔΗΜΗΤΡΗΣΓΑΥΡΟΠΟΥΛΟΣ]

i just loved you, eager to watch the rest of the videos and finally understand how electromgnetism works

[@yoprofmatt]

ΓΙΑΝΝΗΣ-ΔΗΜΗΤΡΗΣ ΓΑΥΡΟΠΟΥΛΟΣ, Thanks for the comment, and keep up with the physics! You might also like my new website: www.universityphysics.education Cheers, Dr. A

[@ts4124]

Very clear explanation. Thank you!

[@mukeshsharma4245]

This is one derivation that I never understood but thanks to you sir now I got it

[@drswarm321]

Thank you Matt Anderson! :D

[@xxtremmewizard1001]

This guy is writing backwards, daamn

[@esfischer]

Or maybe the video image is mirrored...

[@joshuaronisjr]

@XxtreMmE wiZarD notice that he's writing outwards. So, unless he's left handed, he would be writing normally with his right hand, and the picture is mirrored. If he's left handed, then he's actually writing backwards...but, given that only about 1 in 10 people are left handed...the picture is probably mirrored.

[@GauravG91]

Nope actually the guy or professor is writing as usual on the glass placed in front of him and the camera is not directly recording him.. it recording the mirror image of the whole setup.. just google for glass board teaching setup and u will get it.. it is an interesting tech..😊😊😁😁😅😅

[@gustavnielsen6828]

@@esfischer damn son u Einstein's lost son?

[@joshuaronisjr]

@XxtreMmE wiZarD notice that he's writing outwards. So, unless he's left handed, he would be writing normally with his right hand, and the picture is mirrored. If he's left handed, then he's actually writing backwards...but, given that only about 1 in 10 people are left handed...the picture is probably mirrored.

[@yoprofmatt]

Joshua Ronis, The board is called Learning Glass. You can check it out at www.learning.glass Cheers, Dr. A

[@joshuaronisjr]

@@yoprofmatt Thanks Prof. Anderson, I'll check it out! And thanks for all your lectures. They're definitely helping me better understand physics while school is cancelled through this entire corona-virus affair.

[@randykubick]

Cool vid. What affect does a highly dense electric volume have on the elapsed time of a photon passing through it?

[@neartosun]

thanks you P Anderson

[@ricardovaras4667]

He looks like Benedict Cumberbatch.

[@vigneshks8572]

awesome teaching

[@yoprofmatt]

Thanks for the note. Keep up with the physics! Cheers, Dr. A

[@DeeDeeLecter]

🤗 thanx sir! Ur lecture seriously helped me for something called edema or stuff like that like in medicine. Yeah...like to figure out how to turn edema into energy. 🤔 in theory radiation should help wth such condition, but then u have cancer 🤭 Oh, well...🤭

[@GauravG91]

It looks like he is unveiling the conquest of finding the energy density with us.. similar to Dora the explorer..

[@yoprofmatt]

Gaurav, I love Dora! Don't be hatin. Thanks for the comment, and keep up with the physics! You might also like my new website: www.universityphysics.education Cheers, Dr. A

[@GauravG91]

@@yoprofmatt is that.. you like Dora.. then I really apologize for that professor.. love u professor for your lectures.. ❤️

[@mayankcr7tiwary957]

Sir my question is off topic but I got confused so I am asking that as we know emf is the potential difference across the two ends of a battery or conductor when no current is drawn from it but in electro magnetic induction we read that due to variable current emf is induced so how can a current induce emf in a coil

[@yoprofmatt]

Mayank Cr7tiwary, Current makes a magnetic field which then makes emf. Thanks for the comment, and keep up with the physics! You might also like my new website: www.universityphysics.education Cheers, Dr. A

[@mayankcr7tiwary957]

@@yoprofmatt thank u so much sir for clearing the doubt

[@bhooveshwaran3590]

How does that apply to any electric field when you took volume and area of the capacitor??

[@yoprofmatt]

The capacitor was simply used as a specific example for how to calculate energy density. Since the capacitor quantities dropped out entirely (A & d), that makes the energy density independent of this particular geometry. Cheers, Dr. A

[@johanlibert4261]

Hey how can we know if he writes backwards or mirror image?

[@JfC_HipHop]

Most people aren't left-handed

[@atul6147]

So can we say that the energy is of the field rather than that of the capacitor?

[@andershansson5327]

I have been troubled by this line of reasoning for the better part of 25+ years. According to Lorentz, free charge carriers in metallic capacitor plates are responsible for allowing a capacitor to reach a higher electrostatic energy state. If there is a dielectric material present between the plates, the electric field between the plates is partially cancelled by a polarization phenomenon inside the dielectric material whenever an external voltage is applied to the plates and the dielectric responds accordingly. On atomic level, a huge number of molecules in the material are (almost) simultaneously turning and realigning themselves in the dielectric during the capacitor charging process in order to try to cancel the increased electrical field as much as possible. Not all materials are the same, but as a first approximation, no work is carried out by the dielectric molecules during the process of turning. Hence, the polarization phenomenon thereby facilitates a higher polarization level on the capacitor plates for any given voltage applied. The capacitor plates is "where the action is". while the dielectric between the plates allows the electrons to "get the job done". I am personally localizing the energy to the plates. This view can be challenged, but it's important to give a reason and I do believe I have given my reasons here.

[@atuljaiswar5429]

​@@andershansson5327 Well 25 years, I'm not even that old. But what I understood from what you said is that since the dielectric molecules don't do any work so there is no energy (sort of like a spring that when compressed stores energy ,not exactly that way but just to make sense) in the dielectric, correct me if I'm wrong.

[@andershansson5327]

@@atuljaiswar5429 Yes, I believe I follow you, but any proverbial spring pressure still resides with the charges in the plates of the capacitor. Maybe a better analogy is to argue that you have two buckets of water as models of two different capacitors, with and without dielectric. The capacitor with dielectric represents a bucket with a larger diameter and the one without this feature is a bucket with a smaller diameter. The relative increase in diameter of bucket number 2 s an "enabler" for greater energy storage in the form of more water per any given water level with respect to the bottom (or ground). It is exactly the same for the electrical capacitors, their voltages and their charging levels.

[@yeny7194]

is the equation V=Ed or V= -Ed ? our professor gave us the one without the negative so now I'm confused

[@dascointamil5253]

Wtf....he is writing backwards...

[@dipakkumarbaishya4813]

I think this is a mirrored video..