Defining Electric Field around a charge
Electric field around a charge or system of charges is defined as the force experienced per unit charge. Won't the original field be disturbed by the test charge's own field ? How then the original...
View ArticleWhy is the index of refraction dependent on the dielectric constant..
and frequency? Could someone point me in a direction where this is explained in depth? I understand polarization and the dielectric constant as I've taken E&M 1
View ArticleVector B in Magnetic Potential Energy
U = -m x B Is B the total magnetic field of the whole system? If there is two objects X,Z and they all have a magnetic field. But different strengths, I want to calculate the U for Z, B should be the...
View ArticleWho does work when we walk?
Okay, so I know that static friction does no work since work is defined as: W = ∫F.ds. The displacement is defined only for the point of contact. So, when one walks, one foot remains on the ground. The...
View ArticleConservation of Linear momentum and Kinetic energy
Suppose that we are working with a horizontal string with two masses attached. There is no friction on the floor and we move those two attached masses away from the equilibrium position by an undefined...
View ArticleBasic question on temperature
Today I've got rid of a lot of questions but one remains so far. The definition of temperature I've seen in Callen's book is ##T=\left ( \frac{\partial U}{\partial S} \right ) _{V, \{ n_i \} }## (i=1,...
View Articleintuitive reason for the capacitors/inductors in AC current
Hello, I am wondering, why conceptually an inductor would have a large inductive reactance at high frequencies, and why they are large for capacitors are low frequencies.
View Articleangular momentum conserved
Hey all! I am trying to figure out physical situations when angular momentum is and is not conserved. If anyone could share some theory here and illustrate with a few "real life" examples this would be...
View ArticleLaser disruption
I have a question that I haven't found any information elsewhere on how to approach. Just because yahoo answers seemed particularly keen to sniff out homework and mock those asking questions by it,...
View ArticleWhat is Spatial and Temporal Coherence.
Can anyone provide a simple explanation of spatial and temporal. I can't seem to understand the Wikipedia page on Coherence.
View Articlewater pipe physics
I'm new here but after a recent break of a brand new piece of glass, I want to design a new one and get it custom made. I have two things that I want for this design: I want the glass to be strong...
View Articlemoment of inertia of an ellipse
hello! I have to verify the formula of the moment of inertia of an ellipse about its' centroidal axis, is it M*(a^2 + b^2)/4.This is the one I got by myself. But in a webpage it was given as...
View ArticleFriction direction of a set of contact points
Assume that a box is motionless and is located on the floor ground (one box's face touches the floor completely). If we apply a force to this box such that the box keeps its motionless state, what we...
View ArticleIntersection of electric field lines.
Field lines do not intersect because at their point of intersection,we would get two tangents indicating two directions of electric field at that point. Suppose the two filed lines JUST touch at a...
View Articlewhen two equal electric current flow opposite to each other in a wire
Let us consider a circuit... There's a 10 V battery... A Rh(resistor with changeable resistance) and another battery is connected in parallel in the circuit... Now current I (due to the 10 V battery)...
View ArticleInverse Dynamics - 2 Rigid Bodies connected with hinge
I am trying to simulate and animate inverse dynamics. So I need to calculate torques. I started out by just taking a rod which rotates about its COM, applied a torque and then just used...
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3D Rotations - Confused with multiple rotations
I've been trying to wrap my head around 3D rotations and specifically, Euler angles. I thought I had a good understanding of performing multiple rotations, but after writing a Matlab script that...
View ArticleMechanical energy in EM
In griffith it is mentioned that the sum of the mechanical energy and electromagnetic field energy are conserved in a system, how is the mechanical energy defined in this case since a potential energy...
View Articleunits of transmittance
I don't get this. Everywhere I look, the units of transmittance of light are dimensionless. I get that it's a ratio of incident to transmitted radiation, t(f) = I(f)/T(f), and these two have the same...
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