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## Main Question or Discussion Point

For a Dipole and a Torad (or a Solenoid) I need to find the scalar Potential,phi, Charge Density,rho, and then 4-Electromagnetic Current,J(rho*c,

-grad^2(phi) + 1/c^2*d/dt(phi) = rho/epsillon0

where grad(

-grad^2(

I need a little help deriving rho, phi and

This is not a homework problem this is for my personal use.

__j__) where__A__and__J__are 4-vectors and__a__and__j__are 3-vectors.-grad^2(phi) + 1/c^2*d/dt(phi) = rho/epsillon0

where grad(

__A__(phi/c,__a__)) = -1/c^2*d/dt(phi)-grad^2(

__A__(phi/c,__a__)) + 1/c^2*d/dt(__A__(phi/c,__a)__) = mic0*__J(__rho*c,__j)__I need a little help deriving rho, phi and

__J__for a copper solenoid of diameter, d.This is not a homework problem this is for my personal use.

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