: Re: [Vo]: Voltage versus field, and the electrophorus
In a 2 plate capacitor when together the field strength is concentrated more
on the inside of the 2 plates, while there is the same net field once
separated now it is spread out, and the field of the opposite plate isn't in
range so
In reply to John Berry's message of Wed, 14 Feb 2007 19:27:45 +1300:
Hi,
[snip]
In a 2 plate capacitor when together the field strength is concentrated more
on the inside of the 2 plates, while there is the same net field once
separated now it is spread out, and the field of the opposite plate
Robin van Spaandonk wrote:
In reply to John Berry's message of Fri, 9 Feb 2007 08:12:00 +1300:
Hi,
[snip]
That's how many electrostatic machines work such as the Wimshurst.
There are 3 different things, voltage, field strength and charge imbalance,
in this case the Voltage goes up, however
--- Michel Jullian [EMAIL PROTECTED] wrote:
Robin is right, in a parallel plate capacitor
C=epsilon*A/d
so q (constant here) = C*v = (epsilon*A/d)*v =
epsilon*A * v/d
so v/d is constant too.
Michel
A tricky thing here was I thought I remebered using
this formula using English units
Robin is not right.
A metal sphere and a metal cone of equal capacity at an equal voltage and
charge imbalance will have the same net electric field.
But the electric field density at the point of the cone (along with the
charge imbalance density at that point) is greater than the electric
Yup, that was meant to be I'm not wrong about this.
I was changing it from I don't think I'm wrong about this, decided I was
certain so I removed the uncertainty but by doing so reversed it's meaning.
On 2/15/07, John Berry [EMAIL PROTECTED] wrote:
Robin is not right.
A metal sphere and a
In reply to John Berry's message of Thu, 15 Feb 2007 11:42:17 +1300:
Hi,
[snip]
Robin is not right.
Robin was talking about two flat plates. Granted, they only appear as flat
plates when close together. The farther apart they are moved, the more they
begin to approximate points.
A metal sphere
It applies to plates just the same.
On 2/15/07, Robin van Spaandonk [EMAIL PROTECTED] wrote:
In reply to John Berry's message of Thu, 15 Feb 2007 11:42:17 +1300:
Hi,
[snip]
Robin is not right.
Robin was talking about two flat plates. Granted, they only appear as flat
plates when close
In reply to John Berry's message of Fri, 9 Feb 2007 08:12:00 +1300:
Hi,
[snip]
That's how many electrostatic machines work such as the Wimshurst.
There are 3 different things, voltage, field strength and charge imbalance,
in this case the Voltage goes up, however the field strength goes down
In a 2 plate capacitor when together the field strength is concentrated more
on the inside of the 2 plates, while there is the same net field once
separated now it is spread out, and the field of the opposite plate isn't in
range so actually it is a lot weaker.
On 2/14/07, Robin van Spaandonk
imagine the bottom larger pan must be upside
down :)
Michel
- Original Message -
From: Stephen A. Lawrence [EMAIL PROTECTED]
To: vortex-l@eskimo.com
Sent: Monday, February 05, 2007 8:57 PM
Subject: Re: [Vo]: Voltage versus field, and the electrophorus
Stephen A. Lawrence wrote:
There's
There's been a little confusion over field strength versus voltage
recently on this list. Here's a cool gadget that helps to illustrate
the difference. Most likely most readers are already familiar with it,
but perhaps it will be new to some. (General description obtained from
Models for
Stephen A. Lawrence wrote:
There's been a little confusion over field strength versus voltage
recently on this list. Here's a cool gadget that helps to illustrate
the difference. Most likely most readers are already familiar with it,
but perhaps it will be new to some. (General
Subject: Re: [Vo]: Voltage versus field, and the electrophorus
Stephen A. Lawrence wrote:
There's been a little confusion over field strength versus voltage
recently on this list. Here's a cool gadget that helps to illustrate
the difference. Most likely most readers are already familiar
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