Can anyone explain where the following expression for the electric field vector comes from? E(r,t)=−∇ϕ(r,t)−∂∂tA(r,t)
where ϕ and A are the scalar and vector potentials, respectively.
Presumably it can it be derived from Maxwell's Equations?
What is stagnation point in fluid mechanics. At the open end of the pitot tube the velocity of the fluid becomes zero.But that should result...
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