Recent content by jerro

Ok, that makes sense. So, with all three coordinates, the expression should be: ∑ Cn cosh( npiy/a)sin(npix/a)sin(npiz) = V0. But what's next?

Homework Statement A metal box has 6 walls, all insulated from one another. The left and right wall are held at V= V0, which are at y=-d and y=d. All the other walls are grounded. The cube has dimensions where walls run from x=0 to x=2d, z=0 to z=2d, and y=-d to y=d. Homework...

Sometimes we set potential to equal zero at infinity, other times at the origin. What's the general rule of thumb here-how do I know which to choose when doing a problem?

Ah, I see. Separation of variables is completely doable! I don't know what I was thinking. Thank you so much.

Funny for me to stumble across this post: I have been in your position exactly, and I felt the same things you're describing. In my junior year of undergraduate physics studies, I picked up a second major in evolutionary biology and ecology. I started working in a lab working with biofuels and...

Homework Statement I have a population problem where: \frac{dy}{dt} = ay - by^{2}-\frac{c*y^{3}}{d+y^{3}} I need to find an expression for y(t). I'm not looking for the answer, just some advice/ helpful hints. Thank you. Homework Equations The Attempt at a Solution I...

Homework Statement You have two spheres. The first is centered at the origin and as uniform positive charge density ρ and radius R. The second is shifted up a distance d, and it has uniform negative charge density -ρ and radius R. Find the E field in the region of overlap. Homework...