Formula_13920

\[\boldsymbol{B}=\operatorname{rot} \boldsymbol{A}, \quad \boldsymbol{E}=-\frac{\partial \boldsymbol{A}}{\partial \partial t}-\operatorname{grad} \varphi, \quad \frac{\partial \varphi}{c \partial t}+\operatorname{div} \boldsymbol{A}=0,\]