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Reply-To: "Kevin Aylward"
From: "Kevin Aylward"
References: <3D7DBD37.27C9BDEC@ipricot.com> <email@example.com>
Subject: Re: Complex number quiz
X-Newsreader: Microsoft Outlook Express 6.00.2600.0000
Date: Tue, 10 Sep 2002 12:52:06 +0100
NNTP-Posting-Date: Tue, 10 Sep 2002 12:52:08 BST
"Gibbo" wrote in message
> markp wrote:
> >If you want to while away a few more >hours, how about this one:
> >A square field 50m x 50m has a cow in it. >The cow is tethered to a
> >rope that is fixed exactly half way down >one side of the field.
> >The rope is just long enough for the cow >to eat exactly half the
> >grass in the field. How long's the rope?
> Try this one then. This came from an EE magazine many years ago (I
think ETI or
> Elektor - not sure which)
> A string of resistors infinitely long thus:-
> 5R | 5R |
> \ \
> / 9R / 9R etc etc etc
> \ \
> / /
> 8R | 8R |
> The right hand side of the chain continues out of the window. What is
> resistance measured on the left hand side ?
> You can't actually measure it because the electrons would take an
> long time to travel the circuit so you'll have to calculate it.
> Any takers ?
Since the input resistance at any point will be the same at any other
Rin = 13R + 9R.Rin/(9R+Rin)
This is a quadratic equation in Rin.
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