this post was submitted on 02 Dec 2024
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Hi everyone and welcome to the new Megathread :) For my first Mega I want to share a special interest of mine: the magnetic field and how to understand its behavior intuitively.

I'm guessing most of us have played with magnets before at some point and have felt that mysterious force pushing them apart or pulling them together, depending on how the magnets are oriented toward each other. Some of you may have also seen diagrams like this (By Geek3 - Own work,This file was derived from: Ironfilings cylindermagnet.svg This file was derived from: Magnet compasses.svg, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=88524982)

Or done an experiment where you visualize the magnetic field lines with iron filings like this (Public domain, Newton Henry Black, Harvey N. Davis (1913) Practical Physics, The MacMillan Co., USA, p. 242, fig. 200)

These lines represent the shape of the magnetic field. The way you can interpret them is that if you place a compass in the field, the compass will align with the field lines at that point. And the closer the lines are to each other, the stronger the magnetic field is in that area. Also, magnetic field lines always form closed loops. They appear to end at the poles of a magnet, but actually they continue on inside the magnet. They do however exit/enter the magnet at the poles.

"But Witchy," you may ask, "why are the lines so concentrated at the poles but then they spread out so much as they travel from one pole of the magnet to the other?" Excellent question my theoretical student XD.

This is I think the key point that was a bit of a eureka moment for me when I realized it a long time ago when I was studying this stuff: the magnetic field lines "want" to be as short as possible while also "wanting" to be as far apart as possible. And when I say want, it does actually behave a little bit like a desire, as the magnetic objects in this field will experience a magnetic force tryin gthe move the object to spread out the field lines and make them shorter.

Let's use this picture I grabbed from Wikipedia as an example: (By Geek3 - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=10555891)

the bar magnet creates a strong magnetic field at the poles, which means lots of magnetic field lines are squeezed closely together at the poles where they enter/exit the magnet. These lines don't want to be so tightly packed together, so they immediately start spreading out but also immediately start curving towards the opposite pole to try to keep the distance short. If you then try to bring the north pole of another bar magnet close to the north pole of this one, both have magnetic field lines coming out trying to get to their respective south poles, but now even more tightly packed together as you bring the magnets together. Since the magnetic field lines don't want to be so close together, both magnets experience a force pushing each other away so that the magnetic field lines aren't being pushed together so tight.

Similarly, if the south pole of one bar magnet is brought near the north pole of another, the magnetic field lines exiting the north pole of one want to go to the south pole, but the closest south pole is the south pole of the other magnet being brought close, so now the lines go through both magnets before looping back around: (By Geek3 - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=10515628)

However, between the closest poles of the two magnets, the lines are still concentrated but will try to spread out between the poles. Since the lines want to be as short as possible and don't want to spread out, the magnetic field exerts a force on the bar magnets pulling them together, since that would shorten the lines between the poles down to pretty much nothing.

Finally, a few of you may have been wondering what determines how much the magnetic field lines want to spread out vs shorten. These two tendencies are in opposition pretty much all the time, since spreading the lines out more requires making them longer. This is determined by something called the magnetic permeability which is a property of the materials that the field is passing through (even air or a vacuum). High permeability materials tend to concentrate the magnetic field lines more and allow them to get shorter, while low permeability materials tend to force the lines to spread out and lengthen. Examples of materials with high permeability are iron, cobalt, and other magnetic or ferromagnetic materials. Low permeability are pretty much anything that doesn't experience force in a magnetic field, so most things.

Post thumbnail attribution: (By Omegatron - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=640068)

Anyway I hope some of you enjoyed this rant or find the information here useful. I can talk about magnets all day so feel free to hit me up if you want, though my inbox will be overflowing for the next week I'm guessing.

Enjoy the Mega!


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(page 2) 50 comments
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[–] Tomboymoder@hexbear.net 13 points 7 months ago (1 children)

I got cancelled by the woke doggirl-gloom

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[–] Thallo@hexbear.net 13 points 7 months ago (4 children)

YouTube, please, I can't be called out this way.

spoilerYouTube has finally discovered I'm trans

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[–] bolshevikLovelace@hexbear.net 13 points 7 months ago (2 children)

ranti have to go to a christmas thing tomorrow with my partner and a bunch of people i half-know but haven't seen since pre-transition. that's mostly fine, i got over my initial anxieties. ONLY TO FIND OUT MY PARTNER'S MUM WENT AND TOLD EVERYONE I'M TRANS AHEAD OF TIME "so they won't feel embarrassed while i'm there." jesus fucking christ - if they misgender/deadname me i'll correct them, if they're embarrassed because of that then fuck them not my problem

and to top that my partner's dad keeps calling me "man" while he calls all the cis-women "love", hasn't said my name once in the last 4 months since i came out (i don't think partner's brother has either?). it just hurts because they've always been more supportive than my bio parents, idk i thought he would be better than that

soooooo really not fucking looking forward to it, will probably try to dip super early. wish i could plan to get high when we're home but i'm on the last week of a t break ughhhh

rant over

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[–] Tomboymoder@hexbear.net 12 points 7 months ago (1 children)

what a cromulent fuckcrustable day

[–] Eco@hexbear.net 11 points 7 months ago* (last edited 7 months ago)

puppy needy drinky?

[–] LocalOaf@hexbear.net 12 points 7 months ago (2 children)

New boots came in the mail

Officially new boot goofin'

deng-cowboy

πŸ‘’πŸ‘’

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[–] EstraDoll@hexbear.net 12 points 7 months ago (6 children)
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[–] EstraDoll@hexbear.net 12 points 7 months ago (2 children)

they keep telling me "ur so young" but it's hard to really feel that when i wake up every day the oldest i've ever been

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[–] alexandra_kollontai@hexbear.net 12 points 7 months ago (1 children)

yoooooo magnets are so cool! thanks for this!

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[–] blipblip@hexbear.net 12 points 7 months ago (2 children)

Not sure if this is the best place to ask but:

Anyone have any reading material for someone who just doesn't get gender? (Thinking more article length, not books, ADHD gang)

Idk what I'd call myself and I think part of the reason is I just plain don't understand what people mean when they say things like feeling masc cause it's just like what does that even mean??? I'm just doing me what do you mean something makes you feel femme? I reckon I'm some kind of not cis cause I don't think cis people spend much time thinking about it but maybe that's off base? Idk

It's confusing to me in the same way when I found out most people can see things in their head and it wasn't like people talking in metaphor

Anyway thanks you're all great don't let the world get you down but if you do have any links pls send it's a slow work day and I can feel the ADHD fixation coming on

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[–] yewler@hexbear.net 12 points 7 months ago (1 children)

I think thigh highs should dream bigger. I think I could rock a pair of nose highs

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[–] yewler@hexbear.net 12 points 7 months ago (15 children)

I've been on this site for 3 months now, which is interesting in two ways. On the one hand, I've never been this active in an online community for this long. Three months is huge for me. But on the other hand, I actually love you all so much, and it's weird to think there was a time when I wasn't reading all your posts. Like what the hell was I doing 3 months ago???

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[–] JohnBrownsBussy2@hexbear.net 12 points 7 months ago

Bathroom bullshitJesus fucking Christ. This venue has a common wash area and private stalls. Why in the hell do half of them have to be labeled male and the other female. meow-tableflip

[–] Thallo@hexbear.net 12 points 7 months ago (2 children)

When putting away laundry, it used to be really easy to tell which underwear is mine and which is my wife's distress

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[–] buh@hexbear.net 12 points 7 months ago

Vacillating between β€œthe hair loss isn’t even that bad, it’s just one spot and it doesn’t look much worse than 5 years ago” and β€œI may as well just shave it and start wearing wigs”

[–] yewler@hexbear.net 12 points 7 months ago

It occurs to me I'm on a bit of a winning streak of gendering myself correctly in my internal thoughts. That's kinda neat

[–] yewler@hexbear.net 12 points 7 months ago

I'd say that politically I'm fiscally irresponsible but socially awkward. AMA

[–] Josephine_Spiro@hexbear.net 12 points 7 months ago (1 children)

No you don't understand, having my room messy means I'm just like Marx, while by proxy makes me a better Marxist

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[–] EstraDoll@hexbear.net 12 points 7 months ago* (last edited 7 months ago) (1 children)

if i keep thinking about boys like this, I'm going to have to turn in my gay license, fucking hell panting

[–] Thallo@hexbear.net 12 points 7 months ago (6 children)

It's not straight if you say "no hetero" after

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[–] Anvil_Lavigne@hexbear.net 12 points 7 months ago (3 children)

topical t related mishapok so it turns out ur body won't care for it much if an alcohol based gel gets into ur peehole

for some reason i rly wanna put on iron maiden's flight of icarus thonk-trans


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[–] yewler@hexbear.net 12 points 7 months ago

Idk how to describe it but the word "me" feels different after my cute lil haircut

[–] Tomboymoder@hexbear.net 11 points 7 months ago (1 children)

I have a teddy bear called Gaylord

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[–] bubbalu@hexbear.net 11 points 7 months ago (1 children)

Does anybody have any active discords floating around? I broke up with my boyfriend and feeling pretty lonely.

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[–] Eco@hexbear.net 11 points 7 months ago (2 children)

signed up to my local library and went there with my wife

been here a year should have done that already

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[–] BatsAreRats@hexbear.net 11 points 7 months ago (4 children)

Chat I accidentally megadosed my eshot because I was using a needle I wasn't used to and now my tits hurt a lottttt πŸ˜–

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[–] lilypad@hexbear.net 11 points 7 months ago

Finally writing music again a little bit. It has been so long. Im happy and excited!

[–] Wmill@hexbear.net 11 points 7 months ago

facial hairis gone feeling good now niko-happy basically the more facial hair I have the more depressed I am. I remember years ago I had a full beard and well I wasn't exactly happy/healthy mentally but now I stay smooth.

[–] SorosFootSoldier@hexbear.net 11 points 7 months ago

Second [tips cowboy hat]

[–] EstraDoll@hexbear.net 11 points 7 months ago (4 children)

"god you've been thinking about boys so much recently are you even still into girls at all?"

looks at girls

"OH GOD YEP I STILL LIKE THOSE. FUCK." hexbear-bi-2 panting hexbear-lesbian

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[–] oscardejarjayes@hexbear.net 11 points 7 months ago (9 children)

Any other gifted kids stay gifted? It seems to be an uncommon experience, oddly enough.

[–] belligerentkitten@hexbear.net 11 points 7 months ago (2 children)

i mean, i'm extremely gifted at dropping out of university, burning out, and drug use.

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[–] LocalOaf@hexbear.net 11 points 7 months ago (7 children)

dysphoria/executive dysfunctionNeed to shave and do skincare stuff

Don't want to have to look in the mirror

Know I'll feel less wretched after I do it but can't muster up the willpower to suffer through dealing with it yet

Somebody yell at me to take better care of myself pls

catgirl-flop

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[–] Kiagz@hexbear.net 11 points 7 months ago (2 children)

feeling very depressedEverything feels hopeless and pointless. Every attempt to turn my life around has failed, and things just keep getting worse.

I'm unable to make any real progress in my transition, just keep taking my HRT but there's been no noticable changes for half a year now, even though my levels are all good. Same thing goes for facial hair removal. How many more fucking laser sessions do I need in order to get rid of this last part? Voice training seems impossible for me, and I'm many years away from being able to afford any of the surgeries I want. I'm so tired of being stuck like this.

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It has been an honor hosting this week's mega. See you all in the next one :)

[–] gaystyleJoker@hexbear.net 11 points 7 months ago (2 children)

i am happyi feel so powerful lol

i never realized i could be this person i guess. just very glad to have people i care about, who care about me

[–] gaystyleJoker@hexbear.net 12 points 7 months ago (4 children)

still happyi fucking love making people feel valued and important!!!!!!! it is a drug to me!!!!!!!! i want everyone who is special to me to know that what they say and feel is worth something!!!!!!!!!!!!!!!

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[–] Wmill@hexbear.net 11 points 7 months ago (2 children)

I think my style is something like "earnestly writing with a crayon" and so far it's neither helped me in my attempts in dating or securing a job agony here's hoping it's just a rough phase I'm going through and I'll look back fondly on this stage. Good things are coming mario-thumbs-up

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