Boundary conditions in Electrostatics
If I have a grounded conducting material, then I know that $\phi=0$ inside this material, no matter what the electric configuration in the surrounding will be. Now I have a conducting material that is...
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Understanding motional EMF
I understand how motional EMF is produced, the magnetic force separates the charges in the rod to create an EMF. I don't understand though, why the current would flow from a lower potential to a...
View ArticleMeasuring Infrared Irradiance for Solar Research
I'm working on research into the feasibility of separating out the infrared rays above 1200 nm in sunlight for solar power generation. Since silicon cells do not effectively harness these wavelengths,...
View ArticleStrange thing happens with the surface polarisation charge density
This confusion is about the following problem: Suppose the entire region below the plane z=0 is filled with uniform linear dielectric material of susceptibility ##χ_e##. Calculate the force on a point...
View ArticleA question about mirrors
I read this Quote: No phase shift accompanies a rear surface reflection, since the medium behind the mirror (air) has a lower refractive index than the medium the light is traveling in (glass). They do...
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[Thin-Film Optics] Incident white light to color
Hello, as you might have guessed, my question revolves around thin film optics. My intention is: Given a two thin-film system residing on top of a semi-infinite (bulk) layer, how can I estimate the...
View ArticleTwo Objects In Thermal Equilibrium
Hello everyone, I was wondering, is there any way of calculating the time it takes for two objects in thermal contact to come to thermal equilibrium?
View ArticleAbuse of Notations?
Hey guys, umm i'm just gonna get straight to the point, why is the notation of dy/dx for example is being abused so badly? it's not a fraction right? because you can express it in newtonian notation...
View ArticleKinetic energy of water molecules after shaking
When water is vigorously shaken the kinetic energy and, hence, the motion of the molecules increase. Which particular forms of energy do increase : the translational energy (is this the energy...
View ArticleMulti-layer magnet with seperate coils
I am trying to make a very strong magnet that will only last for a short pulse, just a fraction of a second, with a high peak current. I am going to use 1mm (18awg) wire, so the resistance should be...
View ArticleRotating frame: a question of interpretation
I'm reading Lanczos: 'The variational Principles of Mechanics'. I need help resolving a paradox - which is probably trivialÂ… Lanczos (page 100 Dover edition) introduces a system, S', rotating at...
View ArticleTrapping light without electricity
Hello all, I would like to know a method to trap light. That is, it should be pretty simple and non-electric. It doesn't need to trap all light, just part of it at the least. It should also be able to...
View ArticleCenter of Mass
Can we define a threshold velocity V for an object with mass(rest) M which the object at motion need to attain so that its center of mass accelerates faster than the Dimensional object?
View ArticleCause for refraction of light
Yeah sure, change in speed of light as it travels from one medium to another. But why does it affect the path? I mean, shouldn't the light ray just go in the same direction with a different speed? Why...
View ArticleSpeed of EMW
Hi, I've read that the speed of em waves in the vacuum is the electric field component frac the magnetic field component, why and how can this be explained more easily ? Thanks
View ArticleRace with Sticks - How to select the best one?
Hi! How shall I correctly describe the velocity, as function of time, for an object put in a stream of e.g. water? My friend wanted to challenge me in the game where a stick is thrown in the water and...
View ArticleCoriolis effect
I am trying to understand the Coriolis effect from some time but i am unable to conceive the idea why the air parcel flowing from west to east on Earth would go southward. what I have understood till...
View ArticleDifference between physical property and physical quantity??
Hi I'm confused after reading the definitions of physical Quantity and physical property: Definition from wikipedia: physical quantity= is a physical property of a phenomenon, body or substance that...
View ArticleOsmotic pressure, question on derivation (TD)
I'm currently reading about thermodynamics and osmosis and I happened to stumble across this paper. There is one thing I don't really understand, though.. In chapter 8 the author wishes to give a...
View ArticleAre all EM waves sinusoidal?
I saw an example of a hypothetical EM wave that had constant E and B fields. Is that possible? How would it be produced? And wouldn't such a wave have an infinite wavelength?
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