(R.Velmurugan) ideally generalize my formula to electromagnetic wave and it"s absence due to an electromagnetic wave insulator, hence derivation of Gauss law in electrostatics , Brewster law in optics.Poission equation .Maxwell equation .DeAlembertian and Laplace equation in electromagnetic theory is...
segment of conductor to the totalBfield of a current in the conductor. For a segment of conductor of length and orientationdlthat carries a currenti,dB=μ0/4πIdl×r̂/r2.In this equation, μ0is the permeability of free space and has thevalueof 4π × 10−7newtonper squareampere....