Bob44's latest activity
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BBob44 replied to the thread I Does Poisson's equation hold due to vector potential cancellation?.I set up an electrodynamics experiment with an axial symmetry which causes the vector potential to vanish. The Lorenz gauge $$\nabla...
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BBob44 posted the thread I Does Poisson's equation hold due to vector potential cancellation? in Classical Physics.Imagine that two charged particles, with charge ##+q##, start at the origin and then move apart symmetrically on the ##+y## and ##-y##...
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BBob44 replied to the thread I Do electron density waves accompany EM waves in coaxial cables?.I guess I should use ##\epsilon##, ##\mu## and ##c## appropriate to the material in the coaxial cable.
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BBob44 replied to the thread I Gauss' law seems to imply instantaneous electric field propagation.Is that also true if I derive Poisson’s equation from Gauss’s law and solve that? $$\nabla \cdot (-\nabla \phi-\frac{\partial...
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BBob44 posted the thread I Do electron density waves accompany EM waves in coaxial cables? in Classical Physics.Maxwell’s equations imply the following wave equation for the electric field...
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BBob44 replied to the thread I Gauss' law seems to imply instantaneous electric field propagation.Interesting. I guess as ##q(t)## is not arbitrary your example does not break causality as we cannot use it to signal faster than light.
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BBob44 reacted to TSny's post in the thread I Gauss' law seems to imply instantaneous electric field propagation with
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The potential at the field point ##p## at time ##t## is given by the retarded-time expression ##\phi(r, t) = \large... -
BBob44 replied to the thread I Gauss' law seems to imply instantaneous electric field propagation.I’ve just used a spherical Gaussian surface with the same center as the charged sphere but with a larger radius so that it encloses the...
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BHi, I'm a Physics graduate who is still interested in the big questions of physics! Bob
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BBob44 posted the thread I Gauss' law seems to imply instantaneous electric field propagation in Classical Physics.Imagine a charged sphere at the origin connected through an open switch to a vertical grounded wire. We wish to find an expression for...
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