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## Main Question or Discussion Point

E = - grad*phi - 1/c (dA/dt).

phi is the scalar potential, and is given. How do I calculate the vector potential = A ?

Is it A = (v/c) * phi ? If it is, then where is this equation coming from?

Thank you.

phi is the scalar potential, and is given. How do I calculate the vector potential = A ?

Is it A = (v/c) * phi ? If it is, then where is this equation coming from?

Thank you.