Minkowski suggested a better way to write $K^{\mu}$ is in terms of the field tensor, $F^{\mu\nu}$,
$$K^{\mu} = \dfrac{dp^{\mu}}{d\tau} = q\eta_{\nu}F^{\mu\nu}$$
What are the units of the components of the field tensor?
1. ${\frac{N}{m}}$
2. ${T}$
3. ${\frac{Ns}{Cm}}$
4. ${\frac{V}{m}}$
5. None or more than one of these
Note:
* Correct Answer: E (it's B and C)
<img src="./images/capacitor_S_Sbar.png" align="right" style="width: 600px";/>
Switch from frame $S$ to frame $\bar{S}$:
How does $E_x$ compare to $\bar{E}_x$?
1. $\bar{E}_x = E_x$
2. $\bar{E}_x > E_x$
3. $\bar{E}_x < E_x$
Note:
* Correct answer: A
Consider the equation
$$\dfrac{\partial G^{\mu \nu}}{\partial x^{\nu}} = 0$$
How many ordinary equations is that really?
1. 1
2. 4
3. 6
4. 16
5. ????