I'm only within half hour train of two and they're both student/staff only I think; although local city might have some books in their library -- I hadn't thought of that :)

That's a good idea actually; their website isn't very clear on the public policy but I'll look into it at some point :) thanks!

Ooh, that looks cool too, I'll definitely check it out shortly! It's easy to forget how many resources are available I guess, thanks for all the ideas and information, you've helped a lot!

@ChrisWhite Who is your quantum physics prof. And yes, i agree, they are probably not concerned about scientific accuracy, though the BBT didn't do too badly for a season or two. Now they don't bother, and the audience doesn't care either.

@ChrisWhite I'd not heard of Interstellar. But they make a lot of movies.

@tpg2114 You are talking about what's called a stapler thesis on Academia.SE .

I'm afraid there's no consensus on Academia.SE either, regarding that.

because that is largely a fraternity with various disciplines and all parts of the world represented.

And the acceptability of a stapler thesis is largely a university specific issue. I mean some places have no problem with that, others call it an extreme form of self-plagiarism.

Worst still, they purchase (and make mandatory) some software and ask you to get a certificate that your plagiarism is below some acceptable percentage.

This is extremely stupid, but anyways, I think the best people to answer that question are people at your university, not people at forums. Latter category will always give idealistic (glory-scattering-at-the-back-of-the-head-type) advice.

@ChrisWhite Ok, thanks.

@New_new_newbie Isn't a stapler thesis a collection of published papers bound together as a thesis? This does seem to be was is being referred to here.

I suppose so. That's a very diminutive term actually. But not very inappropriate at times :)

That last sentence was garbled. I meant to write:

"This does not seem to be what is being referred to here."

@KyleKanos Yesterday you said that because of azimuthal symmetry I should use area and distance squared, not volume and distance cubed for the equation F=(NI)^2*mu_0*A/2g^2?

I was just wondering what exactly azimuthal symmetry is, and how it would affect a magnetic field?

I found a picture that sort of describes my question : rfcafe.com/references/Electricians-Mate-3-NAVPERS-10548/images/…

The soft iron has field lines through the entire thing, and not a section. Wouldn't I use volume to describe what section of iron is being affected by the field?

I know what an azimuth is, but I'm not sure how it would help to have symmetry here. The only thing I can think of, is there is something about azimuthal symmetry in college physics. Since I have not yet taken college physics I wouldn't know how it would help.

@ACuriousMind Hello

@soumyadeep Hi

Well i had a question to ask which i think is a bit stupid for the main site

Its something like this-Is the kirchoff law applicable only in the conservative electric field?

@soumyadeep Where else would you like it to be applicable?

I mean, it's a rule for electric circuits - why would you apply it to other things?

In case of inductors,the field is not conservative.

My school teacher told us we could apply it there.

Hmmm

I have no idea, though Wiki says that it is not applicable there

I don't think this is a stupid question, you should probably ask that on the site

Ok-just needed a conformation.

Moreover our school teacher said the explanation of kirchoff law comes from QM

And i have not read QM

@soumyadeep I get the impression your school teacher should watch more carefully what they say :P

Hmm:)

I'm fairly certain that Kirchoff's law does not need a quantum mechanical explanation

Ok then i will ask it in the main site.

It's "explanation" is the lumped circuit model, which is wholly classical

I cant understand the first line...:(!!

@ACuriousMind "The lumped element model (also called lumped parameter model, or lumped component model) simplifies the description of the behaviour of spatially distributed physical systems into a topology consisting of discrete entities that approximate the behaviour of the distributed system under certain assumptions"

What does this mean??

@soumyadeep Haha...I didn't read that sentence, I guess, it's really just saying that we are describing circuits as if they consisted of several, well-separated elements like resistors and capacitors and such.

@ACuriousMind Ok i am getting it...

And this stands on?

Or this is a principle by itself?

Well, it works ;) I don't know of any "derivation" of it, but I'm definitely not an expert for circuits. I take it as a principle, and don't think that QM has anything to do with it, but there could well be something else behind it, I don't know

@ACuriousMind Ok thanks a lot:))Just clarified a HUGE misconception

Now i'm going to hear the teacher critically;)

Hmm...does anyone else have the top bar notifications not working?

My comment inbox doesn't light up at all, and the rep change thingy just turns slightly green instead of displaying the "+X"

@ACuriousMind Mine did that just now too

@ACuriousMind I think it is suppose to do that if the thing you are being notified about is not a positive change in reputation---say a badge awarded.

But don't quote me on it, I can't provide a reference.

@dmckee I noticed that it does so for badges, but it did it for an upvote on one of my answers.

@tpg2114 I have to say that I have always found the notion of "self-plagiarism" to be pretty ill-defined and goofy. Just signal that you are transcribing the proposal except where things have changed and don't fret it.

A lot of users on Academis SE take a very stiff verbal line, but the fact is that your work is your work no matter how many time you use it. Excessive reuse and paper stretching is an issue, but it is one at the level of milking one idea for many MPUs, categorizing it with the word "plagiarism" it nonsense.

Hello!

Anyone active?

Nah, I'm quite passive.

Lol

Hey, can you answer my question I aimed at KyleKanos this morning?

The one about azimuthal symmetry and magnetism?

On the "azimuthal" part, I believe the azimuthal symmetry is that a solenoid has symmetry about the axis "through" it, and so it is natural to take the angle to this axis as the azimuth in cylindrical coordinates

Okay, but how would that effect my soft iron bar? The whole thing has field lines through it.

I found something to illustrate my point:

Not just the cross sectional area has field lines through it.

Shouldn't I use the volume of the object that has field lines through it, rather than the cross sectional area?

I guess I feel like using the cross sectional area would only work for a 2-D object

What do you want to calculate, exactly?

Anyway, he said I don't need to worry about that, because of azimuthal symmetry

The force exerted on a soft iron bar, by an solenoid

F=(NI)^2*mu_0*A/2g^2

the "A/2g^2" bit is my question

I feel like that gives the force of a solenoid on a 2D object

and that if its 3D, I should use something like F=(NI)^2*mu_0*Volume/2g^3

How are you getting the force? As far as I know, the forces exerted between magnets are quite complicated - I wouldn't know where to start here (so I probably can't help you, sorry)

the 2g^2 bit makes sense, because every field I know is reduced in intensity with the square of the distance. The "A" does not make sense

Force (in N) = (Num turns in solenoid * current in wires)^2 * magnetic constant * cross-sectional frontal area of ferromagnetic material / 2 * the distance between the solenoid and ferromagnetic material^2

Everything but the "cross-sectional frontal area of the ferromagnetic material" makes sense

I feel like it should be "Volume of ferromagnetic material"

@CoilKid But then, the units would not check out

KyleKanos said that the equation using area, not volume was correct because of azimuthal symmetry. I was wondering why?

Yeah, I would have to change to "V/2g^3"

or somwthing like that

*something

My question is "Why area, and not volume?"

Perhaps it would be a question for the site?

I asked, but with 51 views, no answers

@ChrisWhite I don't agree that this is the 'last level' of 'knowing' a formula: The final goal is to see clearly see why it should be like that.

@AshleyDavies any and every textbook in physics can be found online for free

@soumyadeep Wow, that really is the most over-terminologized Wiki quote ever :D

Could anybody with a university library subscription help me out? GaTech doesn't have access to this journal and I need the paper... I could do it through interlibrary loan but it will take a week and I need it sooner

tandfonline.com/doi/abs/10.1080/03610917908812118#.VB4J0haiHNk

@tpg2114 It shows my uni's name at the top,but it still asks for a login -_-

@ManishEarth I couldn't get it through TandF, GT has it through EBSCOHost but only from 2001 onwards

So I can't get that paper specifically :(

Is there a way to flag or otherwise report a user for rude and inappropriate behavior? See physics.stackexchange.com/questions/136510/…

You can flag the comment for moderators

OK