RE- Help with this equati

```Subject:      RE- Help with this equati
Date:  Wed, 28 May 1997 20:53:16 GMT
From:  robert.michaels-at-online.sme-dot-org (Robert Michaels)
Organization: Society of Manufacturing Engineers
To:  tesla-at-pupman-dot-com

I'm writing while on the road, so regrets for not being
of more specific help:

1) --
You do  =not=  have to express the equasion in the form
"d1 = ....  "
in order to use the equasion to find values for d1 (I
assume that's your objective).  Simply substitute
numerical values for all the other variables, and then
do the arithmetic (all right, it's algebra, but only
high-school algebra that you'll have to do).

2) --
Most if not all of the major general purpose mathematics
software packages will solve an algebraic equasion for
any of the variables within the equasion.  (They will also
automatically express an equasion in terms of any of its
variables).  Such packages include:

"Maple";  "Derive";  "Mercury";  "Mathematica"

etc.

Most such packages are sold for a pittance in the
campus book stores of many colleges (in virtually all
colleges having any sort of science/engineering curricula).
You may/may not be asked for student/faculty id when
making the purchase.  [ Hint: ask someone with id (anyone
you encounter in the bookstore) to make the purchase for
you.]
Calculatingly,

Robert Michaels
Detroit, USA

T>       From:  Tom Heiber <theiber-at-lonet.ca>

T>This is an equation I got from Bert Pool's file.

T>=======================================================================
T>    EQUATION 10: CAPACITANCE OF A TOROID
T>
___________________
T>                                                   /    2
T>         C =(1+ (0.2781 - d2/d1)) x  2.8  x      /  2 pi
(d1-d2)(d2/2)
T>                                               /   -------------------
T>                                            \/      4 pi

T>     C = capacitance in picofarads (+- 5% )
T>    d1 = outside diameter of toroid in inches
T>    d2 = diameter of cross section (cord) of toroid in inches

T>    Equation courtesy of Bert Pool

T>=======================================================================

T>CAN ANYONE help me solve for D1 as in D1=........
T>I have been trying to do this without any results (I suck at math)

T>Thank You

T>Tom Heiber

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