Rindler - Mass of Charged Capacitor

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I've placed an article online which is on the mass of a charged capacitor.

"A simple relativistic paradox about electrostatic energy,' Rindler and Denur, Am. J. Phys., Vol. 56 (9), Sept 1987


http://www.geocities.com/physics_world/rindler-87.gif

I mention it for a few reasons:
(1) There is a myth going around that whenever anyone uses the term "mass" unqualified then it means "rest mass"/"invariant mass." This article is an excellant counter example and demonstrates how wrong that claim is.

More examples are at
http://www.geocities.com/physics_wor...istic_mass.htm

(2)It demonstrates with an interesting example that the mass of a complex object must be calculated using the stress-energy-momentum tensor.

(3)I highly recommend reading it. It's also a pretty cool article. :-)

Pete