The Major Conundrum: Why Physics Majors have a Major Problem
When I read threads like https://www.physicsforums.com/showthread.php?t=209590" a small sense of urgency wells up in the pit of my stomach.
You see, I didn't even like physics before I took it in high school. *SNORE*, how could...
Homework Statement
I apologize for my crappy diagramming.
http://img100.imageshack.us/img100/4427/ladderwd4.jpg
The problem text exactly: "Some important kinds of networks are infinite in extent. The figure shows a chain of series and parallel resistors stretching off endlessly to the...
Hmm, I think I am starting to see it. Since the proton will be on the Gaussian sphere at radius r away, for a proton E = \frac{q}{r^2}.
So
E = -\frac{2qr}{a^3} + \frac{q}{r^2} = 0?
correction: So is the field due to the electrons with just E = (-\frac{2qr^3}{a^2})(\frac{1}{r^2}) = -\frac{2qr}{a^3}
I really have no idea how the protons can cancel the electrons unless they were at the same point? Is there any other hint you could give? Thanks again :(
Well, I did the problem. The problem is I KNOW my answer is wrong. Anybody have any idea why? (This is what I've worked out with my friend).
Homework Statement
Imagine a sphere of radius a filled with negative charge of uniform density, the total charge being equivalent to that of two...
Ohhh thank you for that. So U = \frac{1}{2} \int_{a}^{b} \frac{Q^2}{r^2}dr I think.
Yes, I know it doesn't make a difference in the end, but if it did, it is over the negative charge between the two spheres, right? Since inner sphere has charge Q and between inner and outer sphere the charge...
Thanks so much. Now I just have to remember how to integrate a sphere haha. Just to confirm, I think my integral will look like this? I need to retake vector calculus :blushing:
E=\frac{-Q}{r^2}, E^2=\frac{Q^2}{r^4}
U = \frac{1}{8\pi}\int \frac{Q^2}{r^4}dV, dV=r^2sin\phi dr d\phi d\theta
U...
Well, it depends on which car you're talking about. I assume the car heading north.
Think about it this way. The final velocity of vector of 28 m/s has an eastward component and a northward component. Try to find just the northward component of this vector (draw it as a right triangle). I...
Ah sorry about that, 1.30 is just the problem number. Just 2 concentric spherical sehlls.
I "ignored" the constants because I (or rather this book) uses cgs units instead of MKS or SI units.
Are there any biophysicists/grad students in biophysics around that could offer me some advice? (Or if you have any friends/acquaintances in the field).
After mulling through this thread:
https://www.physicsforums.com/showthread.php?t=163072
I am now feeling on less firm ground with...
Hi there. I'm new to PF, so please correct me on any mistakes in presenting my question. I'm just hoping to get some direction in doing this problem right.
Homework Statement
Concentric spherical shells of radius a and b, with b > a, carry charge Q and -Q, repsectively, each charge uniformly...