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Force Between Two Concentric Solenoids

Imagine a finite length solenoid with outer radius R1 and inner radius R2. This solenoid has a time-varying current going though it. This solenoid is also fixed so that it cannot move. Now imagine...

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Relating physics forces and entropy

Consider proton and electron are seperated in space at some finite distance.Now suppose they released then the decrease in potential energy equals kinetic energy but as electrons or protons are...

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Radiation from a charged harmonic oscillator

Anyone know if there are any graphical simulations online for the field of a charged harmonic oscillator, or better yet maybe some kind of paper on it?

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why is dielectric breakdown damaging?

Dielectric break down... i understand that there is current passing through the insulator but why is this damaging to the insulator? please go as deep as you can. thankyou

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FLUXGATE magnetometer - how it works

Assuming that I am looking at an 'ideal' fluxgate magnetometer. I am feeding this transformer an ideal sine wave. The secondary winding output and the primary winding input are fed into two channels of...

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Diffusion equation with an external force

I thought I would do a little physics for fun, since it has been over 20 years since I last did any. I picked up Sethna's Stat Mech book. He gives a derivation of the diffusion equation that goes as...

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where the energy goes.?

Flyheel the storage energy. The transfer from mechanical energy to electric energy was equal. The situation was, i got a 1/2 hp electric motor (EM) that can turning a 5 kg flywhell (∅ 28 cm) to 1500...

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Is the electric field inside a circuit non-conservative?

As charge moves around a circuit, their energy increases by each loop. However, I just heard somebody say the total electric field inside a circuit is conservative. How is that possible? Is the field...

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Function multiplied by its complex conjugate

Hi Guys, I have two questions which kind of relate. The first relates to the complex conjugate of a function. Specifically, When a function is multiplied by its complex conjugate, what does that mean...

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Question about an electron beam traveling through static B-fields

In the figures below is a sketch of an electron beam entering alternating static magnetic fields perpendicular to that of the motion of an electron beam. This beam is injected from a 45° angle below...

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confusion about Noether's theorem

Hi, I keep running my brain in circles while trying to get a solid grip on Noether's theorem. (In Peskin and Schroeder they present this as a one-liner.) But I'm having trouble seeing the equivalence...

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Units for flux density

While I do understand the use for the displacement vector D = (e0)E + P, I don't quite understand why they label it as "flux density". The units for the displacement vector are C/m^2. The units for...

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Symmetry and electric fields

Hey. Let's say you have an infinitely wide and long disk with a thickness h. Inside the disk, there is a constant charge density ρ0. Why would the electric field lines be perpendicular to the disk? Can...

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Thin walled polymer balloon deflection

Hi, I am designing an inflatable balloon (long and thin like those used to make balloon animals) with a purpose to support a force in a manner like a cantilever. I am struggling to find...

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Thermionic emissions in magnetrons (amount of electrons emitted)

I was wondering how many electron are emitted by the cathode during thermionic emission in a magnetron and how you would calculate this(how to calculate the amount of electrons emitted), I was also...

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I need some intuition for various EM phenomena

I am using a computational electromagnetics software that solves for the resultant electric and magnetic fields around materials represented as lattices of discrete dipoles. Some of the results are the...

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Frame of reference - forces in a turn (airplane)

Hi, I've seen the forces in a turn depicted two different ways: http://selair.selkirk.ca/Training/Ae...es/lf-turn.gif http://www.free-online-private-pilot...uring_turn.gif Which one is correct? I think...

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Potential Gravitational Energy into Force

How do you derive the equation for gravitational force from the eqauation for potential gravitational energy: e=-Gm/x? For me it seems as though you take the derivative and that would work, but i don't...

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Seeking Affordable Raytrace Software for Throughput

This is somewhat of an extension of tosik's recent post. I work a bit with weak optical signals for PMTs and spectrometers and I am always trying to optimize the light collected by a system. Galilean...

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Kinetic rotational energy of a bar hooked to a coil

I have solved an exercise and I'd like to know if my proceeding about finding kinetic energy is correct or not, because this is the first time that I "meet" a situation like this. "A bar has mass M and...

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