Recent content by karpmage

Oh I didn't see that the wikipedia article was referring to a positive charge. Thank you very much, I understand now why the electrons accumulate at Y. I'm going to use the Lorentz Force instead of Fleming's right hand rule for this kind of question. I also see now that the magnetic field has...

I just want to make sure that the textbook is wrong because I don't know if I'm just making the same mistake over and over again- even if you guys can't give me a straight answer for whatever reason, I'll probably ask my teacher because I just want to be 100% sure. I just thought I'd try here...

Here is proof of the textbook answer:

Hi, According to your answer and the right hand rule related to it-The wikipedia page for Lorentz force says "positively charged particle... will curve perpendicularly to both the instantaneous velocity vector v and the B field according to the right-hand rule (in detail, if the thumb of the...

After some looking around, I can see that Fleming's Right-hand rule uses conventional current, but that doesn't explain to me why the textbook got the answer that it did.

Homework Statement I have a question that involves a wire XY (X moving down the page to Y) moving to the right of the page at right angles to a magnetic field that acts out of the paper. The question then asks me which end of the wire will become positively charged. The textbook uses...

Nevermind, I posted this on another forum and someone answered the question for me. He approached it a little differently, and recommended using mathematica. (Here's a link to his answer)...

I thought I'd just quickly tell you guys why I want to graph this equation before giving it you. We're studying conic sections at the moment, and I started wondering what would happen if I let the directrix be a parabola. I looked at the instance where the directrix is y=x^2. I let the focus...

Just throwing it out there. What is your take on this? Do you think it works due to heat expansion and contraction, or due to electromagnetic forces? It was involved in one of my questions for IYPT last year and our group is still clueless about it. It seems like neither explanation is accepted...

Hi there, I don't really have a question but I just thought I'd share something that I've found and see if anyone could make any sense of it, or find some sort of pattern in the results. I noticed that for some of the first few factorials (from 4! to 12!), (ceiling[(n!)0.5]2-n!)=a perfect...

thanks, this is exactly what i was looking for :biggrin:

I should've mentioned this, I'm sorry, I'm looking for a complex solution to this problem. I was already aware that there wasn't a real solution for x.

I was just wondering whether anyone could tell me what's the solution of x^2=ln(x). This isn't a homework question, I need to know the solution of this equation however for some of the maths that I do in my free time. Also, I'd be interested to see how the solution is obtained. Thanks.

I didn't understand the formulas on the Wikipedia page that you posted here, but now I do. I see that this discussion could have ended a lot sooner.

http://en.wikipedia.org/wiki/Finite_difference I just found this. The segment on Newton Series is pretty much exactly the formula that I put down, just phrased a little differently. I'm going to have to concede that Newton beat me to it.