Recent content by DrPapper

Homework Statement Homework Equations <S>=c \epsilon E2/2 \Delta P = A \Delta t <S>/c The Attempt at a Solution My question is if we need the "box height"? This is my work which I'm assuming is wrong. :CIf there's another problem like this on here please put a link. I didn't see any, but...

This is what my work ended up becoming for the second problem's part A.

Does this mean that the only thing wrong with my solution for 2.A is the \mu0? Or do I need to think this over a bit more? :D Also, if you don't mind, could you help me out with my questions on the first portion? I believe I have the correct answers, but that was from brute force working it out.

Homework Statement Homework Equations Provided in the questions I believe. Here's the triangle from question two. The Attempt at a Solution QUESTION SET 1 TOP OF PICTURE A.) I didn't know how to just "guess" what the constant should be so I actually worked it out. I found the constant...

Thank you for helping me out with this! It helps even just knowing "yes, that's right" or "no, try again." I liked your tips too. I turned in the assignment and turns out I got everything else right as well.

Ha ha, yeah the interpretation of how the ring was rotating was ambiguous. Happened a few times. From the example problems in the Griffith's text I assumed what he meant is the ring rotates about the z-axis and in the xy plane. Turns out it's what he wanted. :D

This is what I've been able to come up with thus far: It would not matter where z' is, the range will still simple be a point. As such I'll call z'=0. The radial part has a point at s'=R. And there is no dependence on \phi so omit it. Now in general...

First, thank you for your help. I recall now about the delta's having reciprocal units of their arguments. I'm confused as to why isn't the volume of the wire a function of s and z? Since I'm working in cylindrical coordinates doesn't any volume in this space have to be a function of the three...

Homework Statement [/B] A very thin plastic ring (radius R) has a constant linear charge density, and total charge Q. The ring spins at angular velocity \omega about its center (which is the origin). What is the current I, in terms of given quantities? What is the volume current density J in...

Thank you I'll check those out. :D

Hello all, as far as I can see this question is not posted already, my apologies if it is and please provide a link. But I'm watching this video on youtube: And at 22:38 there's an expression given for the uncertainty of an arbitrary operator Q, however I'm concerned the expression is incorrect...

Yes, next time I'll need to upload some scans, there was quite a bit of work to type out. I had about 4 pages of work, lol, and I really didn't want to do it in standard script - gets really really messy. I wish the latex preview box was still down at the bottom. But I think I've figured this...

Homework Statement Homework Equations Is my part a correct and am I on the right track for part b? If not please give me some suggestions to get me closer to the right track. Also, how would I even begin c.? We have literally done no examples like this in class. The Attempt at a Solution...

Darn it, I did it wrong again: $$E=E_0(\frac{\hat x + \hat y + \hat z}{ \sqrt 3})e^{i(nK_0(\frac{x+y+z}{ \sqrt 3})-\omega t)}$$

I was trying to write that my attempt at the solution is: $$E=E_0(\frac{\hat x + \hat y + \hat z }{\sqrt 3})e^i(nK_0(\frac{x+y+z}{ \sqrt 3})-\omega t)$$ where $$E_0$$ is just the amplitude of the electric field n is the index of refraction for a material $$K_0$$ is the wave number of when...