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Illustration E-field change generates B-field

E-field change generates B-field
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Time variation of electric field \(\boldsymbol{E}\) produces magnetic field \(\boldsymbol{B}\) around the edge of surface \(A\). This experimental result is called Ampere's law of electrodynamics and is mathematically summarized in the following Maxwell's equation:\[ \nabla \times \boldsymbol{B} ~=~ \frac{1}{c^2} \, \frac{\partial \boldsymbol{E}}{\partial t} \]