Message-ID: <001c01c28711$8b3b2c60$56947ad5@jackie>
From: "Steve Thompson" <steve@eltac.co.uk>
To: rsgb_lf_group@blacksheep.org
References: <7D653C9C42F5D411A27C00508BF8803DCB9CBB@mail.dstl.gov.uk>
Date: Fri, 8 Nov 2002 10:28:12 -0000
MIME-Version: 1.0
Subject: LF: Re: To Ponder over the weekend
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----- Original Message -----
From: Talbot Andrew <ACTALBOT@mail.dstl.gov.uk>
To: LF Group (E-mail) <rsgb_lf_group@blacksheep.org>
Sent: 08 November 2002 09:38
Subject: LF: To Ponder over the weekend


> This simple puzzle caused more discussion in my office this morning than
it
> had any right to.   Have a ponder while waiting for next QRSS symbol to
come
> through.
>
> Andy G4JNT
>
> --------------------------------------------
> From Circuit Cellar magazine, Nov 2002
>
> An oil filled capacitor consists of two plates separated by a dielectric
> made of oil with a dielectric constant of 10.  The capacitance is 10uF and
> it is charged to 10V.  The oil is drained, leaving air between the plates.
> the capacitance falls to 1uF.  Does the stored energy level change?.  If
so,
> where did the extra energy come from or go to?
At a guess, the stored charge doesn't change, so the voltage will. Energy
has to be put into the system to move the oil, therefore the stored energy
can increase.

Am I close?

Steve