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Attributing energy to the field rather than to an
object influenced by the
field is something worthwhile which I can pass on to
my students. So if
there is nothing under the influence of a field,
regardless of field
strength, there is no energy stored in the field.
Thanks JB, this is
something I must have missed in text books, or at
least it wasn't put that
way. This a helpful list. SNIP
https://carnot.physics.buffalo.edu/mailman/listinfo/phys-l
----- Original Message -----
From: "John Barrer" <forcejb@yahoo.com>
To: "Forum for Physics Educators"
<phys-l@carnot.physics.buffalo.edu>
Sent: Sunday, December 02, 2007 1:12 AM
Subject: Re: [Phys-l] EM, is it energy
<lucanus@iinet.net.au>
--- Craig & Margaret Lucanus
wrote: SNIPso. In
or when a book on a
shelf falls and loses PE,
This seems to imply that the book "has" PE. Not
the book/Earth system (one always needs to definethe
system when analyzing energy changes), the workdone
by raising the book to the shelf results in angravitational
increase of energy stored in the Earth's
field.matters is
It may also be helpful to remember that since
computation of system energy is always reference
frame-dependent, the only thing that really
CHANGE in the energy of a system.
John Barrere
Fresno Unified School District
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