Joe Stavitsky
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 Apr 8 asked Choosing between a parallel-plate and spherical capacitor model Feb 26 comment Solving for $r=0$ in an inverse square law Ok, so in this case how can it be said in Couloumb's law that a spherical charge distribution acts exactly like a point charge? More to the point, how shall I calculate F on the surface of a spherical conductor, if F inside is zero? Feb 26 asked Solving for $r=0$ in an inverse square law Oct 14 awarded Critic Oct 14 comment What is the “practical purpose” of Gaussian surfaces? In other words the purpose is just to identify symmetry? Note to mods - I seem to have made 2 upvotes with 1 click Oct 14 awarded Supporter Oct 14 comment What is the “practical purpose” of Gaussian surfaces? I mean, basically occam's razor says we make ideas only if we expect them to expand our ability to explain or predict phenomena. What phenomena are made possible/easier to predict /explain/calculate with g-surfaces? Oct 14 asked What is the “practical purpose” of Gaussian surfaces? Sep 24 awarded Autobiographer Jun 18 awarded Popular Question Dec 21 awarded Tumbleweed Dec 14 asked Design and use of the RLC model for signal processing systems and spatial acoustics Dec 8 awarded Caucus Dec 8 awarded Constituent Apr 28 comment Equations governing mutual inductance and transformers @tmac Edited to conform to your suggestions Apr 28 revised Equations governing mutual inductance and transformers deleted 26 characters in body Apr 27 revised Equations governing mutual inductance and transformers Edited in accordance with sugestions by David Zaslavsky Apr 27 revised Equations governing mutual inductance and transformers added 48 characters in body Apr 26 asked Equations governing mutual inductance and transformers Feb 23 comment size and distance of mirror used in projected “smart” whiteboard What if I wanted to replicate this with an off-the-shelf projector, where I assume accurate measurements of the lens and lcd would be impractical? How then should I proceed?