Thide's treatment of magnetostatics
Hi all, I've been having a look at Thidé's treatment of magnetostatics in the free ebook www.plasma.uu.se/CED/Book/EMFT_Book.pdf A couple of questions, about embarrassingly simple matters that I've...
View ArticleHow Do You Calculate Buoyant Energy?
Buoyancy is an artifact of gravity that moves mass up away from the center of the earth in a fluid whenever the specific gravity of the object is less than the surrounding fluid. Buoyant Force is...
View ArticleElectrochromic Materials Switching Time
So I've been curious about electrochromic materials lately. In particular, the amount of time it takes for it to switch from transparent to translucent and back. Is the switching time a function of how...
View ArticleInternal energy equals to average kinectic energy ?
For ideal gas , can I assume Cv dT = nkT (3/2) , thank you
View ArticleEntropy -- can only calculate entropy only at constant temperature?
Is that possible to calculate entropy when dq=+100J , temperature change from 271K to 273K ? Ice melt until 273K , not an isolated system. Or I can only calculate entropy only at constant temperature?...
View Articleelectrons in electromagnetic induction
Hello, when a coil rotates in a magnetic field an AC is produced at the ends of the coil but do that electrons come from the coil wire ? If yes, shouldn't the coil run out of electrons after some time...
View ArticlePoisson Brackets of EM Field
Since I couldn't find any reference on the subject of Poisson bracket formalism of classical field theory, I'm posting a few question here: A) What are the Poisson brackets of the source-less EM field?...
View ArticleDoes static tension wear out a spring?
Alright, here's the context of my question: I have a pistol for home defense, and I keep a magazine loaded with ammunition in case I ever had to use it. Otherwise, I'd have to scuffle around and load...
View ArticleThreat of an EMP?
So I watched a video recently on YouTube about how one well placed EMP above the United States would wipe out all electronics and military equipment, but doesn't the government have precautions against...
View ArticleCondition of continuity of E field at a boundary
I am trying to understand the derivation of Snell's law using Maxwell's equation and got stuck. My text book says that "the E field that is tangent to the interface must be continuous" in order to...
View ArticleBaking the perfect cake
Hello all, I know this is a slightly unusual post but I'm trying to help my wife, Anna, bake the perfect cake. I suspect like many would be bakers, Anna has been thwarted by inconsistent temperature...
View ArticleEntropy of the universe increases..
We know that if we brought a body at temperature T' in contact with a heat reservoir at temperature T (where T' < T) entropy of the universe increases. What if we brought a body at temperature T' in...
View ArticleFeynman's Nobel classical electrodynamics action
In his Nobel lecture Feynman describes an electrodynamic action between a set of particles (equation 1, one third way thru lecture): http://www.nobelprize.org/nobel_priz...n-lecture.html The action is...
View ArticleIs the Faraday Cage invulnerable?
I was wondering how protective a Faraday Cage actually is, can it be overcome by sending more amperage onto the exterior or does that not matter? Also what would cause a Faraday cage to be ineffective,...
View ArticleSmall oscillations: How to find normal modes?
Hi, I'm studying Small Oscillations and I'm having a problem with normal modes. In some texts, there is written that normal modes are the eigenvectors of the matrix $V- \omega^2 V$ where V is the...
View ArticleProblem understanding rolling motion..
we know that in rolling motion the top of drum has linear velocity 2v if the centre of mass has linear velocity v. thus if a board moves over a drum without slipping it wil roll 2vt=2L if the center of...
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Forces on ropes connected to a slanted ceiling
Hey forum. So I was posed the question whether the forces on two ropes will vary or not depending on if the ceiling from which they are hanging is slanted or not. Here's a picture depicting the...
View Articlerefraction
Hello, why if a ray pass though different materials its direction changes ? couldn't its propagation speed just increase or decrease without having to change the angle ? Thank you
View ArticleOutward force on current loop (Ampere's Force Law)
Hi, I'm trying to calculate the outward force on a loop of wire carrying a current, radially from the center to the perimeter. I found the formula for the force between two parallel wires:...
View ArticleFields of a very short laser pulse, pulse a fraction of wavelength.
Scientists can produce laser pulses of order one wavelength in "length" see, http://www.bbc.co.uk/news/science-environment-19489384 Do Maxwell's equations admit solutions of such short pulses? Can one...
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