All Questions
4
questions
0
votes
1
answer
36
views
Doppler shift phenomenon for non-inertia frames
The Doppler shift phenomenon is well understood when the source and observer are in relative constant motion. However, I'm curious to know how the Doppler shift phenomenon is modified when they (i.e., ...
- 342
8
votes
3
answers
331
views
Apparent violation of the law of conservation of angular momentum in the torques experienced by two interacting electric dipoles
Question
Consider two dipoles $({p_1}\hat{i}$ and ${-p_2}\hat{j})$ kept in the $x-y$ plane at $(0,0)$ and $(d,0)$ respectively. Calculate the torque about the COM.
Approach 1
Suppose we select the COM ...
- 1,295
2
votes
1
answer
331
views
Reference-frame transformation for the Lagrangian of a charged particle
The Lagrangian of a charged particle in a magnetic field reads:
$$
L=\frac{m}{2}\dot{\bf{r}}\cdot \dot{\bf{r}} + q\bf{A}\cdot \dot{\bf{r}}
$$
This is the Lagrangian in the reference frame $Oxyz$.
...
- 1,232
4
votes
2
answers
1k
views
What are change of frame and change of coordinates?
What's the difference between a change of frame and a change of coordinates?
I feel like both are transformations on the coordinates but change of frame changes also the vectors.
- 1,894