Recent content by bfusco

Homework Statement Im having a hard time figuring out how in quantum mechanics things such as momentum can be expressed as an operator. I know the simple algebra to get the relation. Starting with the 1D solution to wave equation\Psi=e^{i\omega x} then differentiating that with respect to x...

Hello all, I am about to start my senior year as a physics undergraduate. Besides the fact that I don't know what graduate degree I wish to go for (engineering or physics), I am fearful that I am unprepared for graduate school and wouldn't mind some advice. 1) What are some good ways to go...

Homework Statement Im doing this practice question and I am to determine the magnetic vector potential A for a cylindrical wire with a uniform current density J. i have already determined B both inside and outside the wire no problem.My issue is in the solution given my professor states that...

Cool. Thank you, but before I finish the problem, there is something I never understood and would really appreciate if you could explain it to me (assuming you understand it). In my first post when I stated r^2=R^2+r^2 -2Rrcos\theta, why is r^2 equal to that?

so I would do the typical conversion, however to be sure I understand it and i am not just regurgitating it, I will describe the conversion. Noting that \phi is the angle from the projection of r into the x-y plane from the x axis, and \theta is the angle from r to the z axis...

I have and that does seem easier, however I still come across an issue of determining the directions of all the given parameters. For example in v=\omega \times r' how do i determine the direction of r'? I would image for the sake of simplicity i can choose it perpendicular to \omega , but I am...

Homework Statement Find the magnetic field of a uniformly magnetized sphere. (this is all that was given in the problem) The Attempt at a Solution I chose the z axis in the same direction as M. J_b=\nabla \times M=0 and K_b=M \times \hat{n}=Msin\theta \hat{\phi} Apparently, I can...

Homework Statement I understand how to determine the direction on rectangular surfaces, however when it comes to a cylinder or sphere or, in the case of the problem i am working on now, for a long rod that has been bent around in a circle i.e a a rectangular ring, I don't know what to do.

the point P is close to where C is in that picture provided. If you draw 2 circles one with radius 'a' and the other 'b' and center those on the origin, then erase the parts of the circles in quadrants 2,3,4, you're left with 2 quarter circles in quadrant 1. Point P would be at the origin of...

thanks for the response. I understand what you have mentioned, my issue is actually using the Biot-savart law to find the magnitude. I am unsure how to apply it to to a point at the center of a circle. B(r)=\frac{\mu_0}{4\pi}I \int dl' \times \hat{r}\frac{1}{r^2} I don't know how to...

Homework Statement Im reviewing for a test so I am doing some practice questions. need help with this one. The questions simply states "find the magnetic field at point P for the steady current configurations shown below. Because i cannot find the exact picture on the internet i am...

Homework Statement Suppose that the magnetic eld in some region has the form B = kzx(hat). (where k is a constant). Find the force on a square loop (side a), lying in the yz plane and centered at the origin, if it carries a current I, flowing counterclockwise, when you look down the x axis...

I believe infinite pulses, although the professor didn't specify

Homework Statement What is the Fourier transform of a single short pulse and of a sequence of pulses? The Attempt at a Solution In class we haven't dealt with the mathematics of a Fourier transform, however my professor has simple stated that a Fourier transform is simply a equation...

Homework Statement The other day in lecture my professor mentioned the words mode locking and phase matching (same as velocity matching apparently) while on the topics of lasers. However, i can't find anything that can provide a simple explanation of what they are. Is there anyone who would...