\(\nabla \times \mathbf{B}=\mu _{0}\left(\mathbf{j}+\varepsilon _{0}\frac{\partial \mathbf{E}}{\partial t}\right)\)

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\(V_{z}=-V_{\infty }\cdot \alpha (t)+\.{h}(t)+x\cdot \.{\theta }(t)+f(x,y,t)\)