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. ????