I'm new to these equations but let's see if I have the talk down. 1. The electric field surrounding a charge will go thru a surface and not come back into the surface. It's strength is proportional to the charge and inversely proportional to the perm of free space. 2. The magnetic field surrounding a current or a magnet will go thru a surface and come back into the surface (therefore the divergence =0). It's strength is proportional to the current and the permeability of freespace and the permittivity of free space. 3. A changing electric field produces a magnetic field perpendicular to the direction of the current by right hand rule. The magnitude of the magnetic field is proportional to the paralelliped formed by two vectors, one being the current vector whose magnitude is proportional to the number of coulombs along a certain defined length of the current vector determined by the defined length which produces a stronger electric field if the length of the wire investigated is longer, the other being the radius along B to the point of interest. 4. A changing magnetic field produces an electric field. The resulting strength of the electric field is proportional to H and the length of wire that interacts with H. Do I have this about right?