# Questions tagged [electromagnetism]

For questions on Classical Electromagnetism from a mathematical standpoint. This tag should not be the sole tag on a question.

407 questions
Filter by
Sorted by
Tagged with
66 views

### Deriving the Yukawa potential from the field of a screened charge

I am trying to derive the Yukawa potential from the electric field of a screened positive point charge, which is $$\vec{E}(\vec{r}) = \frac{q}{4\pi\epsilon_0}\frac{e^{-kr}(kr+1)}{r^2}\hat{r}.$$ The ...
• 159
20 views

### singular positive semi-definite matrix in electromagnetism

anyone knows where he drew this conclusion from?
• 171
103 views

### The reason for curl free

I wonder about the reason for the idea of this, would you mind explain for me this can happen in mathematics. Thank you !
119 views

• 8,750
1 vote
65 views

### Non-homogeneous wave equation, retarded potentials and causality

Consider the non-homogeneous wave equation in three dimensions with homogeneous initial conditions:  \begin{align} & \square f(\underline{x}, t) = g(\underline{x},t), \hspace{3mm} \underline{x} \...
• 1,179
### Why does $\boldsymbol{\nabla} \times \textbf{E}=\textbf{0}$ imply $\boldsymbol{E_2}^{\parallel}=\boldsymbol{E_1}^{\parallel}$?
I am currently studying 'Introduction to Electromagnetism' by David Griffiths, and I was reading about the electric displacement $\boldsymbol{D}$. I decided to try to extract eq. 4.27, which states: \$\...