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...
Its still a work in progress, but I could use some help via critiques.
I am a physics major at Stony Brook University with an expected graduation in the fall of 2014. I plan on building a career that focuses on electronics and optics. Stony Brook University’s exceptional optics program has...
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...
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...