2018-10-09

2018-10-09  本文已影响0人  carpediemmlf

\vec{\nabla} \times \vec{E} = \left | \begin{array}{cccc} \hat{i} & \hat{j} & \hat{k} \\ \frac{\partial}{\partial x} & \frac{\partial}{\partial y} & \frac{\partial }{\partial z} \\ {E_x} & {E_y} & {E_z} \end{array} \right |

which evaluates to

\vec{E}(r, \theta) = \frac{p}{4\pi\epsilon_0r^3}(\hat{r}2\cos\theta + \hat{theta}\sin \theta)

if p = p_0\sin\omega t then the \vec{E} field oscillates and generate electric magnetic waves

\vec{F} = (\vec{p}\cdot\vec{\nabla})\vec{E}

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