In reply to  Stefan Israelsson Tampe's message of Mon, 1 May 2023 17:52:27 
Hi Stefan,

You write:-

"Now the total amount of energy is 2u if we assume equal amount of electrical
energy as magnetic energy, hence if we integrate.
F = Utot/va
But according to special relativity we have,
Utot = mc
F = mc/va
No put v = c we see,
F = ma"

However I think Utot = mc^2 (not mc)
and setting v=c => F = m/a not m*a

If the we instead start with Utot = mc^2 we get F = mc^2/va which after 
substituting c for v => F = mc/a. how does c/a magically become a? ;)

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