This is probably fairly simple, but I have a hard time to grasp the concept of the vector potential A in electromgnetism. Especially, in the following equation for the electric field :(adsbygoogle = window.adsbygoogle || []).push({});

[tex]\vec{E} = - \nabla V - \frac{\partial \vec{A}}{\partial t}[/tex]

When does the second term is not 0 ?

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# I When does the vector potential A affect the E field?

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