Wait Another Minute

From the post "Wait a Minute",

$E=\cfrac{V}{d^2}.x$   ---(*)

comparing this expression with the normal expression,

$E=\cfrac{V}{d}$

we see that $d$ is replaced with

$\cfrac{d^2}{x}$

A comparative graph of the two expressions,

shows that expression (*) has only half the energy.  This means only half the energy delivered to the wire is radiated under normal circumstances (superposition).  This could mean that, if a material follows instead a material density profile of

Graph of d²/x, d=10

such that $E$ is related to the applied $V$ given by (*) then we may have close to 100% efficiency for radiated energy.