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#562 – Electroboom!

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HuronKing:

--- Quote from: Sredni on December 06, 2021, 06:35:56 am ---This Lewin guy must be like one of those aliens from the movie "The Thing". He clearly brainwashed the whole of MIT.
I just found another EM textbook from MIT OCW that has the two resistor rings around a changing flux region... and it agrees with him.
It is also available online for free - surely a way to propagate these... How did Bob Duhamel of RSD Academy call these? Nonstandard concepts that go against the science and engineering establishment? (I'll fetch the exact quote later).

https://ocw.mit.edu/resources/res-6-002-electromagnetic-field-theory-a-problem-solving-approach-spring-2008/
https://ocw.mit.edu/resources/res-6-002-electromagnetic-field-theory-a-problem-solving-approach-spring-2008/about-this-book/
https://ocw.mit.edu/resources/res-6-002-electromagnetic-field-theory-a-problem-solving-approach-spring-2008/textbook-contents/

Not only Lewin must have brainwashed this author, but he clearly has a time machine because this textbook was published in 1979, even before Romer's paper. The sneaky little Dutch devil!

The Zahn-Romer-Lewin ring is in section "6.2.3: Transformer Action", "a) Voltages are not unique" (p. 411)

--- End quote ---

Obviously another 'bad prober.'  ;D

It's clear from Romer's paper that he had a crisis of conscience about KVL - he tells an amusing anecdote when he says he first learned about the non-uniqueness of voltages from Rogers and Shoemaker during an oral exam. I wonder if Lewin had a similar revelation which is why he says "Kirchoff is for the birds and Faraday is not." Unfortunately for Lewin, it also appears his biggest crime was saying "Kirchoff is for the birds, and Faraday is not."

bsfeechannel:

--- Quote from: HuronKing on December 06, 2021, 07:10:35 am ---
--- Quote from: Sredni on December 06, 2021, 06:35:56 am ---The Zahn-Romer-Lewin ring is in section "6.2.3: Transformer Action", "a) Voltages are not unique" (p. 411)

--- End quote ---

Obviously another 'bad prober.'  ;D

--- End quote ---

Mehdi will say that Zahn is adherent to the "old definition of voltage" and that the majority of professors and authors now agree with his "new definition of voltage".

What is this new definition of voltage? It's one that makes Lewin look wrong and Mehdi look right before his audience comprised mostly of dimwits like himself.

When his audience realizes that he's wrong, he'll invent a new stupid explanation and he'll repeat it until it appears legitimized for them.

That's the same technique used by those who spread fake news. Truth sucks. Truth is boring. Truth requires evidence, rigor, proof. Telling you that to be a good engineer you will have to painstakingly study functions, calculus, vector calculus, Maxwell's equations sucks. Saying that, without any formal training in engineering in general and electromagnetism in specific, you can confront a seasoned engineering course professor and author at a respected technology institute is cool and takes no more than a 10 minute video quickly slapped together, intermingled with slapstick comedy jokes.


--- Quote ---It's clear from Romer's paper that he had a crisis of conscience about KVL - he tells an amusing anecdote when he says he first learned about the non-uniqueness of voltages from Rogers and Shoemaker during an oral exam. I wonder if Lewin had a similar revelation which is why he says "Kirchoff is for the birds and Faraday is not." Unfortunately for Lewin, it also appears his biggest crime was saying "Kirchoff is for the birds, and Faraday is not."

--- End quote ---

No doubt. For many of us, the full implications of the electromagnetic phenomenon is a shocking event. One that gives room to the so called five stages to acceptance: denial, anger, bargain, depression and acceptance. At first there is an outright rejection, then a resistance. Resignation comes right before the acceptance of reality.

thinkfat:
It's actually much easier to cope with once you accept that the induced electric field is not IN the circuit. Then you stop looking for it and try modeling it with tiny batteries.

jesuscf:

--- Quote from: HuronKing on December 06, 2021, 07:10:35 am ---
--- Quote from: Sredni on December 06, 2021, 06:35:56 am ---This Lewin guy must be like one of those aliens from the movie "The Thing". He clearly brainwashed the whole of MIT.
I just found another EM textbook from MIT OCW that has the two resistor rings around a changing flux region... and it agrees with him.
It is also available online for free - surely a way to propagate these... How did Bob Duhamel of RSD Academy call these? Nonstandard concepts that go against the science and engineering establishment? (I'll fetch the exact quote later).

https://ocw.mit.edu/resources/res-6-002-electromagnetic-field-theory-a-problem-solving-approach-spring-2008/
https://ocw.mit.edu/resources/res-6-002-electromagnetic-field-theory-a-problem-solving-approach-spring-2008/about-this-book/
https://ocw.mit.edu/resources/res-6-002-electromagnetic-field-theory-a-problem-solving-approach-spring-2008/textbook-contents/

Not only Lewin must have brainwashed this author, but he clearly has a time machine because this textbook was published in 1979, even before Romer's paper. The sneaky little Dutch devil!

The Zahn-Romer-Lewin ring is in section "6.2.3: Transformer Action", "a) Voltages are not unique" (p. 411)

--- End quote ---

Obviously another 'bad prober.'  ;D

It's clear from Romer's paper that he had a crisis of conscience about KVL - he tells an amusing anecdote when he says he first learned about the non-uniqueness of voltages from Rogers and Shoemaker during an oral exam. I wonder if Lewin had a similar revelation which is why he says "Kirchoff is for the birds and Faraday is not." Unfortunately for Lewin, it also appears his biggest crime was saying "Kirchoff is for the birds, and Faraday is not."

--- End quote ---

Definitively another guy that doesn't understand that the voltage between nodes VAD depends only on the unique path of the original circuit, a circuit which is not changing shape or moving.  When measuring, the voltage the instrument displays depends on the path of the instrument wires, but that is not the voltage VAD, it is the voltage at the instrument!  With that understanding it is a trivial task to find the correct and unique voltage between nodes VAD which is independent of the path of the instrument wires.  So, how do you find the correct voltage between nodes 'A' and 'D', VAD?  Using KVL of course!

Sredni:

--- Quote from: jesuscf on December 06, 2021, 03:27:31 pm ---
--- Quote ---https://ocw.mit.edu/resources/res-6-002-electromagnetic-field-theory-a-problem-solving-approach-spring-2008/
The Zahn-Romer-Lewin ring is in section "6.2.3: Transformer Action", "a) Voltages are not unique" (p. 411)

--- End quote ---
Definitively another guy that doesn't understand that the voltage between nodes VAD depends only on the unique path of the original circuit, a circuit which is not changing shape or moving. 

--- End quote ---

Of course. The MIT is notoriously known for its scarcely prepared professors of physics and engineering.
Here is yet another professor who does not understand the basics of electromagnetism!
Shame on you, MIT!!!
Listen to the guys in a garage, instead. They have an oscilloscope, so they clearly know what they are talking about.


--- Quote ---When measuring, the voltage the instrument displays depends on the path of the instrument wires, but that is not the voltage VAD, it is the voltage at the instrument!  With that understanding it is a trivial task to find the correct and unique voltage between nodes VAD which is independent of the path of the instrument wires.  So, how do you find the correct voltage between nodes 'A' and 'D', VAD?  Using KVL of course!

--- End quote ---

I would love to see you get the voltage on the conductors that join the resistors in this square ring, asymmetrically placed inside a square toroidal core, by simply using KVL.
Keep in mind that the induced field Eind is no longer directed along concentric circles, and your ring is now square.
Good luck using KVL.

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