Why Do Ferro- magnetic/electric Domains Exist?
In short, what I am asking is what is the reason/cause of the formation of ferro- magnetic/electric domains, and how would one calculate the 'driving energy' in order to predict domain formation? If we...
View ArticleDivergence of r / r^3.
I have searched the forums and the internet to see various discussions about the divergence of an electric field, or more directly, the divergence of r/r^3. I still don't understand this "spike at r =...
View ArticleThe meaning of the constant G
Hi, was it Newton the first to describe the gravitation formula?, did he do that in his Principia? and, most of all , what is the meaning of the constant of proportionality G? Thanks a lot
View ArticleMeaning of this identity
What is the physical meaning of Jacobi identity for Poisson brackets? When does it come in handy? It goes as follows: {f,{g,h}}+{g,{h,f}}+{h,{f,g}}=0 Thanks.
View ArticleInduction, magnetism (flux), and current
Hi, inductance is the property of a conductor by which a change in current in the conductor "induces" (creates) a voltage (electromotive force) in both the conductor itself (self-inductance)....
View ArticleWhat is this nature of Electrostatic Field ?
Hi all, Work done to move a charge between two points in electrostatic field is independent of path taken. what is in this electrostatic force that is causing this? I mean how is it making it path...
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An electromagnetic paradox?
Consider the system below comprising a pair of oppositely charged parallel plates, connected by a rigid rod of length [itex]r[/itex], constrained to move in the x-direction. The forces on the plates...
View ArticleWhy do free-falling fluids contract?
Let's say you have a stream of water leaking out of an elevated barrel, and we ignore the effects of air resistance and assume water is incompressible. So, the lower (and faster) the waterstream falls,...
View ArticlePressure as a renewable source of energy
I am designing a machine to produce electricity , using pressure as a source of energy. So my question is simple, is there any machine or device that are used to produce electricity from pressure?
View ArticleProjectile motion with air resistance
How do we write differential equations for projectile motion in 2 dimensions featuring air resistance of magnitude kv^2, acting directly opposite to the direction of motion at that moment in time,...
View ArticleWhy does temperature remain constant during melting/boiling?
When ice melts at 0°C, energy is being absorbed to break the bonds. And so temperature remains constant. However, when some of the atoms enter the liquid state why can't they continue gaining heat and...
View ArticlePoint Charge in the presence of charged, insulated, conducting sphere
So here we are talking about solving this problem by method of images. The approach taken by most of electrodynamics textbooks is as follows: "If we wish to consider the problem of an insulated...
View ArticleRotation of a non pivot object
my teacher told.me.that If a rotating uniform stick is falling, the axis of rotation is about the cm of the stick. I dont understand why it is about the cm of the ball. I have searched on google and i...
View Articleself-supply gravity motor
Is it possible to create enough energy( by letting a pound falling to crank a rotor) to bring back up the pound?
View Articleelectrostatics
Question: In the electrostatic case, the expressions F = del(p.E) and F = (p.del)E are equivalent: I am having trouble with how to show they are equivalent In the second equation, I expanded it out to...
View ArticleReceding Electric field/Magnetic Field?
In a circuit, would the electric field produced by emf instantly go to zero upon disconnecting the circuit from the emf source? I would assume there is some sort of time delay. If so, what is it?...
View ArticleWhy does a=g*sin(theta) on an inclined plane
I understand the derivation that on an inclined plane of angle θ, the acceleration of the object on the plane, parallel to the plane, is a=g*sinθ. However, I was just thinking about it, and should it...
View ArticleRotation of Rigid body
In rotation motion do points through which the axis passes also rotate or are they stationary?
View Articleshielding a wire
Hi, how can we reduce field at a point(of observation) 30mm from a 10 m long blank copper wire with return path somewhere at infinity carrying DC current by using a 1m long copper tube 1mm wall...
View ArticleElastic potential
Collegues, please just remind me if I have elastic potential U=( K(x-X0)^2 )/2 for the flexible spring moved on X distance from the initial X0 position So I have I have elastic force F=K(x0+vt-x) wich...
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