PeroK's latest activity
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PeroK reacted to Dale's post in the thread Undergrad Electric Field of Uniformly Charged Infinite Plane with
Informative.
I don’t think they did go awry. It is a valid solution to Maxwell’s equations. It is just a different boundary condition than usual. -
PeroK replied to the thread Undergrad Electric Field of Uniformly Charged Infinite Plane.The horizontal component is zero, by symmetry. I've not got time to do the asymmetric calculation now. I'll do it later. Although...
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PeroK reacted to Vincf's post in the thread Undergrad Electric Field of Uniformly Charged Infinite Plane with
Like.
Hello, The sum you're showing is a Riemann sum. The Riemann sum is $$\sum_{n=0}^\infty f(x_{n})(x_{n+1}- x_{n}) $$ with the function... -
PeroK replied to the thread Undergrad Electric Field of Uniformly Charged Infinite Plane.Re the above identity for ##\pi##. $$\int_0^{\infty} \frac 1 {1 + x^2} dx = \bigg [\tan^{-1}(x)\bigg ]_0^{\infty} = \frac \pi 2$$And ...
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PeroK replied to the thread Graduate Horizontal component of the electric field of an infinite uniformly charged plane.I've started a new thread on how to do this properly...
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PeroK posted the thread Undergrad Electric Field of Uniformly Charged Infinite Plane in Electromagnetism.Here is a valid derivation of the electric field for an infinite plane, based on the result for an infinite wire of uniform linear...
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PeroK replied to the thread Will anyone alive today see a permanent colony on the Moon or Mars?.To many of us Elon Musk (and his kind) are the catastrophe that will destroy life for the vast majority of humans. There would be no...
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PeroK reacted to Baluncore's post in the thread Will anyone alive today see a permanent colony on the Moon or Mars? with
Haha.
That can be achieved with LSD, or the hallucinations of AI, without any need to contaminate Mars with the human epidemic from Earth. -
PeroK reacted to Ken Fabian's post in the thread Will anyone alive today see a permanent colony on the Moon or Mars? with Like.
My pessimism is mostly grounded in resources and economics, at both ends - Earth and 'colony' - but don't dismiss other concerns like...
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PeroK replied to the thread Graduate Horizontal component of the electric field of an infinite uniformly charged plane.You should be able to use any shape (except mathematically pathological ones) and the integral convergence should work. The infinite...
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PeroK reacted to spacecadet2563's post in the thread High School Time travel without paradox with
Sad.
Time travel is logically possible. IF you moved faster than light or even a little less with time-dilation taking effect you live on... -
PeroK replied to the thread Graduate Horizontal component of the electric field of an infinite uniformly charged plane.If you have have linear wires, then the linear charge density must tend to zero, as the number of wires increases. You end up with...
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PeroK replied to the thread Graduate Horizontal component of the electric field of an infinite uniformly charged plane.An infinite uniformly charged plate is a physically impossible construction in classical electromagnetism. A charged particle has...
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PeroK replied to the thread Undergrad Photons & Time: t=0 What?.Time is what a clock measures. In this context, at least.
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Thanks for all responses...