electricity and magnetism are the same thing

electricity and magnetism are the same thing: in 20 minutes-ish!

James Clerk Maxwell: A Dynamical Theory of the Electromagnetic Field —

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[DarthErdmaennchen]

Engineers: Luckily we don't have to calculate all that, we just have to remember the right hand rule!
Phycisists: I don't have time to remember this weird rule, I just calculate it!

[kylehill]

This is like sitting with a really good tutor.

[chrisl]

Maxwell is totally underrated in popular culture for being a brilliant physicist. Arguably, all the discoveries of the early 20th century were only possible because E&M was so well defined that you could both look for deviations from it and reliably build experiments using electricity. And ultimately, we make almost all measurements by turning them into a voltage some way or another and measuring the voltage.

[sowercookie]

My absolute favourite thing is that dr Angela insists on doing the math! I think people get this skewed idea of physics, that's it's just a bunch of quirky factoids, because no one shows the math involved (and then some of them start thinking they're smarter than the physicists and start coming up with nonsense...) So thank you dr Angela!

[KR]

Ten years ago, I got 2 points off on an exam for writing 'electromagnetism' instead of 'electric force' and 'magnetic force' when asked to name all of the forces. They refused to give me a re-grade, and to this day I hold a hold a grudge for that decision.

[kashphlinktu]

Omg I did the same thing in a physics exam, luckily my professor was merciful and wrote “used left hand rule. Error carries “. And only deducted a few points

[physicsnerd]

Tangent topic, but my favorite exam in grad school E&M was to derive Maxwell's equations, only assuming the existence of magnetic monopoles. We then proceeded to use those equations to solve a few other problems, and the results were somewhat spectacular in a way I didn't expect.

[thylacoleonkennedy]

26:19 I actually feel sort of the same about Darwin. He had no idea about how heredity worked or how variation actually came to exist in populations but the level of understanding we've developed of evolution since the discovery of genetics and DNA, how massive the field of evolutionary biology has become and how completely it's vindicated Darwin's ideas is really mindblowing. On the other hand he died way before we discovered the kinds of concepts that would do that, but it's still realy interesting to think about.

[RichardKCollins]

When an electron goes for a walk, the magnetic field she produces is going down into the ground on her right. The positive charge walking beside her, his magnetic field is going down into the ground on his left.

[capitano]

The charge is nonzero in the frame where the electrons are at rest due to length contraction, not because “we prevent the electrons from moving”. We didnt prevent them from moving, we just went to a different frame. If in the previous frame the electrons were moving to neutralize the charge, in the new frame the protons would be doing the exact opposite motion. The reason is that in a moving frame lengths contract so the densities of positive and negative charge no longer match. Alternatively, charge is the time component of the electric 4-current so it transforms under boosts. But preventing the electrons from moving doesn’t make sense.

I don’t mean to be overly critical, I love these videos! But i wanted to comment on this. I’m sure Angela knows what I just said and was trying to simplify, but it felt like an oversimplification that misses the (in my opinion) coolest part of the demonstration!

[wtfpwnzred]

Watched the guys on safety third talking about radio wave emission recently, and i wish they could get someone like this to come explain it to them

[azzydraws]

BABE WAKE UP A NEW DR. COLLIER VID DROPPED

[naikrovek]

13:26 - "I don't think you should have to memorize things" this spoke to me on some fundamental level, and I was not prepared for it. I've been trying to communicate this to my software development colleagues, who like to just memorize things instead of finding ways to make them easy to figure out by others later.

[Pscribbled]

The nice thing about the right hand rule is that it makes electromagnetism immediately teachable in highschool without the need to have like half a year of learning and understanding linear algebra.

I actually like the handed rules. I’d have my left hand rules for electrons and right hand rules for current. There’s not too much to memorize if you do it that.

[seanys]

We still have magicians called electricians. They appear at your home and all the money in your wallet disappears.

[fluffy_tail]

Maxwell is so underrated in popular science. Classical electromagnetism is already such a pretty theory by itself and the guy worked on so many other things.

[HexanaMusic]

Adding to what others have already said, I was taught the right hand rule for the field around the wire, and the left hand rule for the force.

[johnpassaniti]

I love your channel. Not only do you explain things far better than I was taught, you do it with humor and snark.

[heather___moran]

Angela, I wish you had a PhD in every field so I could listen to you talk about every topic ever, from history to microbiology 😭 women in STEM are amazing

[JCUDOS]

13:25 "I don't think you should have to memorize things. Like we should just understand why it works"
There's why I hated school ever since they tried teaching us negative numbers didn't exist in the very first year of primary. XD
Love the way your mind works! Great upload!