Where is it gone ?

[Bob Bruhns]

My dad said that the lost energy went into radiation from the
magnetic pulse during the charge transfer.  I assume that's true,
but I don't know for sure.

  Bob, WA3WDR


----- Original Message -----
From: "Andre Kesteloot" <andre.kesteloot@verizon.net>
To: "AMRAD Tacos" <tacos@amrad.org>
Sent: Friday, November 08, 2002 1:48 PM
Subject: Where is it gone ?


> Assume you have two identical, loss-free 1uF capacitors, one
charged
> to 10V, the other is discharged.
>
> You then connect the two in parallel so the total C is now 2uF -
> charge will flow from the charged capacitor into the discharged
> capacitor.
>
> Assuming charge Q is conserved, and that Q=CV, the voltage must
now be
> 5V.
>
> But the stored energy in a capacitor =1/2CV^2, so with the single
> charged capacitor, the stored energy is 1/2 x 1uF x 100 = 50uJ,
while
> with both capacitors in parallel it is only 1/2 x 2uF x 25 = 25uJ.
> So where has the other 25uJ gone?
>
> André
> (from the RSGB LF Reflector)
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