Return-Path: Received: (qmail 12768 invoked from network); 8 Nov 2002 09:41:42 -0000 Content-Transfer-Encoding: 8bit Received: from murphys.services.quay.plus.net (212.159.14.225) by mailstore with SMTP; 8 Nov 2002 09:41:42 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: (qmail 29111 invoked from network); 8 Nov 2002 09:41:13 -0000 Received: from post.thorcom.com (193.82.116.70) by murphys.services.quay.plus.net with SMTP; 8 Nov 2002 09:41:13 -0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 X-SQ: A Received: from majordom by post.thorcom.com with local (Exim 4.10) id 18A5bR-0002od-00 for rsgb_lf_group-outgoing@blacksheep.org; Fri, 08 Nov 2002 09:39:01 +0000 Received: from [192.5.29.49] (helo=relay.dstl.gov.uk) by post.thorcom.com with smtp (Exim 4.10) id 18A5bR-0002oU-00 for rsgb_lf_group@blacksheep.org; Fri, 08 Nov 2002 09:39:01 +0000 Received: (qmail 28957 invoked from network); 8 Nov 2002 09:38:57 +0000 Received: from warlock.dstl.gov.uk (192.5.29.10) by relay.dera.gov.uk with SMTP; 8 Nov 2002 09:38:57 +0000 Message-ID: <7D653C9C42F5D411A27C00508BF8803DCB9CBB@mail.dstl.gov.uk> From: "Talbot Andrew" To: "LF Group \(E-mail\)" Date: Fri, 8 Nov 2002 09:38:32 -0000 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Subject: LF: To Ponder over the weekend Content-Type: text/plain; charset=iso-8859-1; format=flowed X-Spam-Status: No, hits=1.0 required=5.0tests=EXCHANGE_SERVER,SPAM_PHRASE_03_05version=2.42 X-Spam-Level: * Sender: Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group 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? -------------------------------------------- "This e-mail is intended for the recipient only. If you are not the intended recipient you must not use, disclose, distribute, copy, print, or rely upon this e-mail. If an addressing or transmission error has misdirected this e-mail, please notify the author by replying to this e-mail." "Recipients should note that all e-mail traffic on MOD systems is subject to monitoring and auditing."