This simple puzzle caused more discussion in my office this morning than it
had any right to.   Have a ponder while waiting for next QRSS symbol to come
through.

Andy G4JNT

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From Circuit Cellar magazine, Nov 2002

An oil filled capacitor consists of two plates separated by a dielectric
made of oil with a dielectric constant of 10.  The capacitance is 10uF and
it is charged to 10V.  The oil is drained, leaving air between the plates.
the capacitance falls to 1uF.  Does the stored energy level change?.  If so,
where did the extra energy come from or go to?

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