SammyS's latest activity
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What Jackson says there regarding discrete charge distributions is (my emphasis added): So the self-energy terms are there in principle... -
SammyS reacted to haruspex's post in the thread Is it possible for a vertical rod balancing on a table to lose contact by striking the top of the rod? with
Agree.
It is stated as frictionless, but it makes no difference anyway. -
SammyS reacted to mmfiizik's post in the thread Two-layer dielectric, four-capacitor model vs three-capacitor model with
Like.
Thank you all for explanations. I tried to prove this to myself by contradiction, but it might be an oversimplification. If we assume... -
SammyS reacted to Steve4Physics's post in the thread Two-layer dielectric, four-capacitor model vs three-capacitor model with Like.
I don’t think that’s correct – there will be discontinuities in charge-densities and field-strengths as you move left to right. To add...
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SammyS reacted to Dale's post in the thread I Varying resistance readings depending on how I connect my meter with Agree.
The breadboard seems to add 0.4 ohms of resistance.
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There are two slightly different versions of the Euclid proof. If we assume that we have all the finitely many prime numbers, then the...
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I'd forgotten this puzzled me in the past: whether there is a magnetic field from a current must depend on the frame of reference...
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SammyS reacted to Dale's post in the thread I Ampere-Maxwell law seems to contradict causality? with Like.
No. It just means that your assumption is wrong. Look, your assumption is basically that something happened which is so fast that...
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The question was for the OP.
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Yes, my basic remark was that squaring isn't an equivalence operation, i.e., it cannot be uniquely reversed. One has to keep this in...
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Here is the derivation mentioned in post #30. Refer to the figure on the right. It shows half the hexagon as a quadrilateral inscribed...
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SammyS reacted to jbriggs444's post in the thread B 'splain this hydrostatic paradox in tiny words with Like.
I assume that the mechanism includes some sort of identical pistons inside the vertical glass walled tubing. The scale pans are then...
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Say we have a transverse wave, moving in the +x direction, along a string. There are 2 very different types of graph and it’s easy to...
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SammyS reacted to PeroK's post in the thread What Determines the Minimum Mass of Block B for Movement on an Inclined Plane? with Like.
I don't see the problem here. All the analysis is just to convince you that the simple approach works: calculate the force needed to...
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A lot o numerical analysis involves dealing with spaces of polynomials of degree at most $$N$$ on $$[-1,1]$$. There are various families...