Richard Clark wrote:
My answer stands, contradicted but without ANY correction.

I have corrected it in another posting. With a 50
ohm, 141.4V Thevenin source, the answer is 200 joules,
not your 100 joules. It takes two seconds for a one
second long lossless feedline to "fill up" with energy.
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73, Cecil http://www.qsl.net/w5dxp