Dipolo elettrico: differenze tra le versioni

:<math>\mathbf{p} = \int\limits_{V} \sum_{i=1}^N \, q_i \, \delta (\mathbf{r'} - \mathbf{r}_i) \, \mathbf{r'} \ d^3 \mathbf{r'} = \sum_{i=1}^N \, q_i \left( \int\limits_V \delta(\mathbf{r'} - \mathbf{r}_i )\, \mathbf{r'} \ d^3 \mathbf{r'} \right) = \sum_{i=1}^N \, q_i \mathbf{r}_i</math>

 

 

:<math>\mathbf{M}=\mathbf{p}\times\mathbf{E}</math>