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Re: First EM lab



If you estimate the radius of the pencil point, and you know the maximum
E field before an arc can occur in air, then you can easily estimate the
charge on the pencil point. Alternately, having previously shown that
about 1 in 100,000 surface sites on the tape is charged, you could make
a reasonable estimate of the charge on the pencil point.


cheers,

joe

On Sun, 13 Jan
2002, Herbert H Gottlieb wrote:

On Sun, 13 Jan 2002 14:45:18 -0500 Joe Heafner <heafnerj@VNET.NET>
writes:
From: Bernard Cleyet <anngeorg@PACBELL.NET>

The charge, local g, and the mass (inter allia?) are missing.


They're not missing. Part of real life problem solving involves
making educated assumptions.

But what would you use for a probable "Educated Assumption" for the
charge
on a charged pen? 1 uuC?? ....1 uC ? ...10 uC? ... 100 uC? .... or ???

Herb Gottlieb from New York City
(Where guesstimates of local charges on charged pens vary by several
orders of magnitude)


Joseph J. Bellina, Jr. 219-284-4662
Associate Professor of Physics
Saint Mary's College
Notre Dame, IN 46556