Many thanks!
I had used Mathjax some time ago.
It was the need to refresh the browser which had evaded me! (And the ability to Preview!!, and escape from Preview!!!).
Hi thanks for your attention.
TLDR: I have actually solved my primary goal of demonstrating that the Gauss equation gives the same result as the textbooks by using a different equation than the one I derived and used above.
But for fullness here is what happened...
In my original post I...
Please can anyone either:-
(1) point me to a derivation of the perpendicular force (Fy) between two very long parallel wires carrying steady currents utilising the formula of Gauss for the force F along the line r between 2 charges?
Or alternatively (2) point out where I have gone wrong in my...