Recent content by colinven

I am trying to numerically calculate the electric potential inside a truncated cone using the finite element method (FEM). The cone is embedded in cylindrical coordinates (r,phi,z). I am assuming phi-independence on the potential, therefore the problem is essentially 2D; I am working only with...

Hi everyone, I am looking for some advice. I just graduated with my BSc in physics this June. I applied to do my physics masters, but with a GPA of 3.0 I was not accepted. I am now searching for a job, without much luck. In university I did not actively acquire hands on skills beyond my...

This is a typical problem in an introductory course to condensed matter physics. I recently solved this problem and had some trouble conceptualizing it, so I thought I would make a post on how to solve the problem. In general the problem will be stated like this: "Prove that for an ideal HCP...

Nevermind, I see what you did there! Haha.

Simon Bridge: How can you equate kinetic energy and rest mass energy? The electrons are moving, not at rest.

Yes I used the mass of the electron as 9.11 E -31 Kg. And "q" is the charge of one electron: 1.6022 E -19 C.

Recall, 1 electron has charge e=1.6×10^{-19} C , this means that 100 electrons would have charge 100e , etc. Current I is a measure of the change in charge per change in time. I=\frac{ΔQ}{Δt}. You can think of current as a flow of electrons, and the current is a measure of how many electrons...

MateuszS, you are using the correct formula: F=qvB. where v is the velocity of the electrons coming off the lamp. Notice, 14000eV is the kinetic energy of the electrons coming off the lamp, and this energy can be converted to Joules (J). We can write the kinetic energy as...

Thank you Bobbywhy and russ_watters for reading and responding to this post. This subject has been on my mind for a while now, and it feels great to share my ideas. When we look at telephone poles fade into the distance they do not fade linearly, but instead the relative height of each...

This thought came from staring at telephone poles and light posts along roads and walkways. I noticed that these objects all had the same height more or less and were regularly spaced. The poles and appeared to reduced in height (following some mathematical relationship) as the distance between...