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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?