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Faraday’s law of electromagnetic induction is mathematically described by which one of the following equations?

1. $\nabla\ \bullet \overrightarrow{B} = 0$
2. $\nabla\ \bullet \overrightarrow{D} = \rho_V$
3. $\nabla\ \times \overrightarrow{E} =\ – \large\frac{\partial\!\: \overrightarrow{B}}{\partial t}$
4. $\nabla\ \times \overrightarrow{H} =\ \sigma\: \overrightarrow{E} + \large\frac{\partial\!\overrightarrow{D}}{\partial t}$

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