/sci/ - Science & Math

>>12394807
no happening for you

between EM fields and the aether?

>light has no medium
>light is described by EM fields

>the photon travels through vacuum
>the photon is an excitation of the EM field

It seems the EM field behaves like a... medium?

>>12359236
quite simply, properties spread at the speed of light, thats it.
a field, like the one in the picture.

>>9745956
>that can easily exist on a flat plane
show me

I just graduated with a B.S. in physics. I have a 3.0 GPA, and I got a D in Electromagnetism 1, but an A in Electromagnetism 2. How fucked are my chances of getting into grad school?

shouldn't a force field be uniformly distributed as a three dimensional sphere in space? why do the vectors of the magnetic field loop inward?

Electrons: How do they spin?

>Magnets

Explain how they work.

Hi!

Can anybody explain how magnets work?
I know that its an open question, and the guys are working hard on it in CERN, but I like to hear some theorems.

Anyway, did they discovered the magnetic monopole yet in CERN?

If you put an iron cylinder in a magnetic field, it will become magnetised.

Like in a coilgun.
But what equation can predict how?

I have a question for you fellow /sci/entists.

If you hold some exercise weights up, you get tired, because your muscles have to expend energy to keep them up. However, no work is done because the barbells aren't moving.

Here's where my question comes in.

If you stick a magnet to the side of a fridge, it holds there against gravity (obviously). Also, no work is done, because nothing moves. However, I assume that some energy must be expended to hold it there against gravity, just as in the case of the man holding up the barbells.

But... there can't possibly be, because it has nowhere to come from. So, what's going on?

INB4 "Fucking magnets, how do they work?"

Hey /sci/, sorry in advance for tarding up your board, I'll be gone soon and you can talk about condensed matter or whatever, but something is bothering me about 'dem pesky magnets.
What it is is, how come you get electromagnets, but not electro-un-magnets, like a wee neodymium thingy-ma-bobbbin with a button that turns it off by applying a current to it.

Is it normal for my body to be slightly magnetic? I don't know what layer is, maybe my bones or something. If I hold a compass it will point to me, then actually work once I move it about 10cm away from my skin. Metal only attracts slightly, but I can suspend a magnet from the undersides of my arms etc.
Anybody know what this is called?

The most convincing argument I've seen is the idea of the looping singularity.
The idea is that the universe never came from nothing. There were always particles, of energy and elements, but was being collected at a "magnetic pole" of absolute zero, and compressed to such a point that it reached singularity, at which point, it switched poles.
Think of a funnel connected end to end with another funnel. On the left side of where they meet, there is an impossibly strong "pull". As things get pulled closer and closer they slow down, condensing over and over and continue toward the center. At a point, it finally meets the center and then is "pushed" from that center. and subsequently ripped apart by the intensive pulling energies coming from right behind the push.
pic kind of related.

Hm, /sci/ I forgot something, give me a hand.

Given a vectorial function like f(x,y) = (x,y), how do I find the field lines in order to graph them? I should get something like y = kx for this example if I remember right.

I'm trying to understand magnets, and am completely new to them, so I have a very basic and possibly stupid question:

When something says a Gauss is equivalent to "one line of force per one cubic centimeter", what does the line of force represent? Does it mean a force of one newton, or does magnetism actually travel in individual lines, and Gausss measures the number of those lines?

I heard the LHC has a small chance of creating a magnet during the collisions. Since science does not yet know how they work, I consider this a very dangerous idea.

Unless of course someone is able to clarify just exactly how these "magnets" work.

MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGN
ETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+
_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~
MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGN
ETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+
_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~
MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGN
ETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+
_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~
MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGN
ETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+
_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~
MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGN
ETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+
_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~
MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~MAGNETS+_!!~

You would become a magnet.

Besides the inevitable "fuckin magnets, how do they work?" are there any actual good magnet jokes? The only half decent one I've been able to find is:

What did the male magnet say to the female magnet?

I'm attracted to you.

How can we really understand magnetism if its only a theory (a gauss)?

So /sci/, i know how magnetic fields looks, how they can be used and such. What i dont know is HOW and WHY?

Anyone care to elaborate?

TL;DR
how the fuck does magnets work?

Wait, seriously, how do magnets works? I understand the concept of magnetic fields and shit, but how does an isolated piece of metal or whatever generate a fucking force?

well you see, there are these things called electrons that flow through a conductive medium such as iron. the flow induces a force field perpendicular to the flow, this is called magnetism.