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/sci/ - Science & Math

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4145128 No.4145128 [Reply] [Original]

>Rock physics 101-121
>Take E and M class
>First class involving electricity and magnetism
>Have no feel for the quantities involved, there's less problem solving and more memorization
>Have less math than what's required, have to teach self a good many things
>Get ass kicked all semester and not even sure if passed

>> No.4145137

>paying to learn

>> No.4145147
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4145147

>>4145137

>> No.4145155

>>4145147
>he pays to learn

>> No.4145157
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4145157

>>4145155

>> No.4145161

>>4145128

Same boat.

A+ in Physics I
A+ in Physics II
D in Electromagnetics

It's all just derivations. You have to work like a dog all year to do well.

I proceeded to fail Electromagnetic waves, this was all years ago.

>> No.4145162

>>4145157
I got paid to learn since my 3rd year at university-level.

>> No.4145167
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4145167

>>4145162

>> No.4145171

>>4145161
I'm taking Diff Eq's and Calc 3 before I take another shot at it, if I didn't pass. I'm set for Calc 3, though, because they cover pretty much everything we did.

>> No.4145180

>>4145167
(About 1250 euros per month, net, from my 3rd year to my 5th year, and then about 1450 euros per month, net, during my PhD, not counting a few teaching hours here and there)

>> No.4145184
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4145184

>>4145180
How about I continue to slap your shit?

>> No.4145192
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4145192

>>4145184
how many of these do you fucking have??

>> No.4145195
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4145195

>>4145192
You probably don't want to know

>> No.4145196

>>4145184
Please don't stop, I'm starting to enjoy it. I don't really have anything to boast about anymore though. Oh, yeah right: I skipped roughly half of my classes, and worked roughly 15-20 hours per week for my PhD.

>> No.4145200
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4145200

>>4145196
>>4145180
>>4145162
>>4145155
>>4145137

>> No.4145204

ITT: stupid people regretting that they had to pay to learn

>> No.4145206
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4145206

>>4145204
ITT: Some one getting their shit slapped.

>> No.4145208

WTFBITCHSLAPPINGDANCE!!!

>> No.4145212

>>4145211
You would be dead by now.

>> No.4145211
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4145211

ah, if only you could actually slap people over the internet...

>> No.4145219
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4145219

>>4145212
heheheh... yeh probably.

>> No.4145221
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4145221

>>4145128

>> No.4145336

>>4145171
It's silly to learn E&M without taking it at the same time or having taken Calc 3 prior. Diff Eq will help but only slightly i feel. Did you not take physics in high school? Also what in general did you struggle with? I know I had some difficulty with Gauss's law, which would be incredibly tough to understand if you haven't done anything with Calc 3.

>> No.4145357

>>4145128
I did great in Physics 1 and 2, but I just finished up Electrodynamics and Magnetism 1, and did pretty bad in it. Took Calc 3 and Diff Eq. Didn't learn what I needed to in those classes. There was a lot of material that was left uncovered and many concepts that we not taught, and the professor was a total douche. I took a course on Analytical Mechanics and did better in that then this shit.

>> No.4145358

>>4145336
I learned Gauß in E&M, just like I learned most of my math in physics first. It took some time until math caught up, but at that point I already had a good working knowledge.
For normal E&M courses you don't need to know much about analysis anyway: ministokes, gauß, "what does nabla do", "how do I integrate along a curve" is basically it.

>> No.4145362

>>4145336
FUCKING THIS.
I felt so bad for the little peons in my university class who were just then taking calculus II and learning series... it was disgusting.
Taking Calculus 3 before hand is probably the best advice I could ever give to someone regarding doing well in electricity and magnetism.
If you just learn a cross-product... its amazing how much easier it can be.

>> No.4145410

>>4145162
Polytechnicien, normalien ?

>> No.4145440

Maxwell's equation makes a lot more sense if you know your vector calculus well. Or are we talking about basic EM?

>> No.4145439

>>4145410
Normalien.

>> No.4145441

Really OP? I found electromagnetic stuff to be far more intuitive than like kinematics and shit. But then, I had more math than usual before taking the class, so when we got to Maxwell's equations is was more like a "woah that's beautiful, it all makes sense now!" moment lol. Same with Euler's Identity, why isn't this shit taught sooner? Everything else I learned previously all makes so much more sense in light of this shit.

>> No.4145442

>>4145362

Please explain a cross product, all i know is two vectors x the angle between them and it doesn't fucking work.


how do i into biot savart, gauss, fucking shit like "the surface charge of a sphere is proportional to the radius, find the charge enclosed", shit that has triple integrals flying around the fucking place that i don't fucking understand.

>> No.4145445

>>4145439
(Also, I think polytechniciens only get something like 800 euros, net, but that might have changed)

>> No.4145466

>>4145357
That's unfortunate. If you do fail, learn the shit out of Greene's theorem, Stoke's, curl/div, and line integrals. E&M is applied Calc 3, so if you take it again next semester, just learn and practice this all over winter break.

>>4145442
Oh dear. Luckily after these courses you most likely won't need to use Calc 3 again.

>> No.4145477

>>4145442

triple integral is for the volume of a sphere, like double integral is for a surface and single integral is for a line or curve.

>> No.4145494

>>4145442
You just need to know the various theorems and how all aspects are related to each other. It really is all quite simple, just know how the charge on the surface of a sphere is related to the enclosed charge, do some basically ceremonial calculus (shit generally works out to the simplest case, that's kind of the point) and solve. I can't remember the details offhand, but it sounds like you're overthinking all of this stuff. And the cross products is basically a determinant of a 3x2 (or sort of symbolically 3x3) matrice or some shit.

>> No.4145534

>>4145494

Is there any good websites

>> No.4145556

>>4145534
Haven't actually watched the videos, but this site should help:
http://academicearth.org/courses/physics-ii-electricity-and-magnetism

Really, a good teacher makes all the difference.