Core Definition and 469 Threads

I have two coils standing next to each other. One is connected to a power supply and the other one is connected to a lamp. When I put an I-shaped iron core through both coils the lamp shines brighter than without the iron core. The same thing happens when I use a U-shaped iron core. When I...

(a) (i) Express \(\sqrt{48}\) in the form \(k\sqrt{3}\), where \(k\) is an integer. (1 mark) ...(ii) Simplify \(\displaystyle \frac{\sqrt{48}+2\sqrt{27}}{\sqrt{12}}\) giving your answer as an integer. (3 marks) (b) Express \(\displaystyle \frac{1-5\sqrt{5}}{3+\sqrt{5}}\) in the form...

[FONT=Times New Roman]1. The line \(AB\) has equation \(7x+3y=13\). [FONT=Times New Roman] [FONT=Times New Roman](a) Find the gradient of \(AB\). (2 marks) [FONT=Times New Roman] [FONT=Times New Roman](b) The point \(C\) has coordinates \((-1,3)\). [FONT=Times New Roman] (i) Find an...

Homework Statement I am looking for a general explanation of when the total reluctance of a magnetic circuit is not equivalent to the sum of the reluctances if each area. In several examples the text has added 2 areas in parallel and then added the third area. I'm not 100% sure on when this is...

How big does a planet have to be in order for it to have a molten core or a magnetic field? Assuming no other large objects were close enough to affect the planet with their own pull or magnetic field. I would imagine the composition/density of the planet would play a factor as well, but do we...

Hi, I'm wondering if anyone has any sources for off-axis point calculation for multiple current carrying loops that contain a soft iron core. I have been using this resource so far and I can figure out how to include multiple loops. How would I approach these calculations with an iron core...

is there still single core cpus still in production?, before people start saying use multicore etc I've already explored this and the reason behind my unusual question is that I am trying to run an old game server on my pc, however it will not run on multi core systems the usual solution which i...

The Reference Frame: A confirmation of the 130 GeV dark matter-like bump - Lubos Motl [1204.2797] A Tentative Gamma-Ray Line from Dark Matter Annihilation at the Fermi Large Area Telescope - Christoph Weniger [1205.1045] Fermi 130 GeV gamma-ray excess and dark matter annihilation in...

in terms of what buying what is the dereference between hard and soft iron? i know an iron core is good but what about cast iron?

Scientifically, it doesn't make sense why you can't just wind up wire without really much air in the middle. In order to get more wire closer to the magnetic flux, why wouldn't you just wind up the coil tighter? I keep seeing ferromagnetic or air cores. Why not a tightly would wire so more...

Hello. I am wondering what are the properties of matter at the core of a neutron star. I read that it could be quark matter of strange matter, but overall uncertain. How can strange matter form if strange quarks decay very quickly into up quarks (the state of matter would last very shortly), and...

Homework Statement Calculate the typical energy of nuclei in solar core. Calculate thermal energy required for a proton to overcome the Coulomb barrier and get within range of strong nuclear force (10^-15m) Homework Equations None given The Attempt at a Solution I have the core...

Hello all, First time here and first time posting. Just like to say a quick hello before getting started... Due to the rise of solar PV panels being installed before the Feed in Tariff was cut earlier this year (in the UK) I've been thinking about the cable losses that these incur...

I have this solution that I don't quite understand d(ro*pi*D^3/6)/d(t)=-kr*Cao*pi*D^2 from here I would have thought to separate the variables and integrate but the solution says ro/2* d(D)/d(t) = -kr Cao I guess my question is how are you able to do that? If you take the derivative...

Homework Statement So originally Ag core notation should be -> Kr 5s1 4d10... but looking at it unchanged is -> Kr 5s2 4d9 Does that mean if i take an electron away I take away all the electrons from 5s2 and put them into the 4d8 shell and have Kr 4d10? Homework Equations The...

Homework Statement The AC power supply (maxium voltage 20.0V) in RCL circuit is run at resonance for the following parameters: R = 20.0 Ω L = 88.0 mH C = 79.9 μF When an iron core is added to the inductor, the self-inductance is doubled A) Find the frequency of the generator B)...

[SIZE="2"]By a simple procedure , what should I do when I'm going through the thermal hydraulic design of nuclear reactor core...? .. I put initial guesses for the core dimensions ( fuel , clad , gap , length) initial guess for the fuel element pitch desired power ... I've found q'' critical...

I was recently going through electric machinery fundamentels by Stephen Chapman and noticed the graph of the core loss current. I need help in understanding the nature of the current graph plotted against time, like how its value stays constant for some fixed time then varies linearly.

Faraday's Law of Induction: EMF=-\frac{\partial \Phi}{\partial t} If two identical coil with same turns of wire and same dimension ( same cross section area in the middle), one has only air and the other has a magnet core. If the two placed in an uniform varying magnetic field, is there...

The inductor is initially an air cored one.When the Iron core is introduced,the resistance is found to increase considerably.Please explain.

Does anyone know of any electromagnetic core materials that either do not oxidize or who's magnetic and physical strength doesn't change much when it does oxidize? I need to make a room temperature electromagnet for hydrodynamic propulsion experiments. My first experiments used an air core but...

This article appeared March 2nd on Science Daily. Quite interesting. Any comments? http://www.sciencedaily.com/releases/2012/03/120302101413.htm

Let H be a subgroup of G and define the core of H as such core H={g\inG| g\inaHa^-1 for all a\inG}= \bigcap{aHa^-1|a\inG} Prove that the core of H is normal in G and core H\subsetH. I am having a hard time proving this because isn't the definition of core H basically saying the the core...

Hello everyone, I am trying to make a coil with the exact specs as the original. I have all the info I need except the actual core material used. I have all the measurements of the core and coil including: Wire gauge, # of turns and turns per layer,Bobbin dimensions, inductance without the...

Why is a "potential core" region of a jet called a "potential core"? We all know that there exists a region called "potential core" in a jet where there are no mean velocity gradients. My question is, why is it called a "potential" core?

Hello! I am a grade 12 student. If you are familar with the IB program, I am writing an extended essay (it's a 4000 word research essay) on how transformer losses are affected by temperature. Through two experiments I was able to determine how the losses of the primary and secondary windings...

Ok so this is kinda wishy washy but I don't know how else to explain this other than I feel like I am missing a critical piece of information as far as fundamental "math" goes. I am highly intelligent and and am a Mechanical Engineering Major who gets all A's, but I feel like I am missing a...

Hi There, What's the best core loading pattern optimization method? I believe this is very depended to experts knowledge, I mean the methods such as Genetic Algorithm or Neural Network or Ant Colony are not so useful for such these optimization. Please correct me if I'm wrong on this. Thanks

Was wondering how Jupiter's hydrogen liquid core converts the energy to create a magnetic field? and How exactly do these properties behave? I understand that my phrasing of the Question might be odd and may be wrong but i was just wondering how it worked

Anyone know where I can get a list of different core materials and their permeabilities?

I am working on a project and I need to find out what kind of core material this is... Unfortuantely I cannot ask the person who had it because they no longer have it. I don't think it's ferrite, the thickness is about .125", and the permeability is around 700-1000. It had several coils on...

does it follow that the larger the star the higher the core temperature? if so what would be the highest temperature attained. thanks

Hi all. I am shortly to begin work on my engineering FYP in automatic control and I'm hoping for some advice to point me in the right direction. The project will initially be an electromagnetic suspension rig (cylindrical winding with soft core suspending a permanent magnet below it via...

I am building a 400W power amplifier that is designed to work between 10MHz to 15MHz. I have a schematic that uses a set of isolation transformers and a set of step-up transformers. I ordered some powdered ferrite transformers from Magnetics (www.mag-inc.com). The isolation set is a...

please help me to solve this problem: Mars has a mean density less than the mean density of the Earth's mantle. How is it possible that Mars could have a metallic core given this fact? Hint: No calculations are required. Compare the densities used in part a) with the density of mantle rocks like...

I've recently been applying to colleges and looking at many of the universities dual core physics/engineering options, however, one of them also offer a "Pre-engineering" program. My question is simply: should I or should I not enter that program, or will the dual core physics/engineering option...

I am struggling with my mathematics indices homework. I think I have some correct answers so far but I'm pretty stumpted on some others. How would I go about solving the following equations. Homework Statement 1) 25 to the \frac{1}{2} - \frac{5 to the -4}{5 to the -5} Homework...

Please explain what is a CORE 2 DUO processor.

Homework Statement Calculate the radius of the Earth's core using the following data: Pe = 5,515 kg/m^3 (earth's average density) Pc = 11,000 kg/m^3 (core's density) Pm = 4,450 kg/m^3 (mantle-crust density) Re = 6377km (radius of the earth) Homework Equations im guessing we...

http://www.projectrho.com/rocket/enginelist.php#id--Gaseous_Core_Nuclear_Thermal_Rocket http://en.wikipedia.org/wiki/Gas_core_reactor_rocket How practical would this be? How much of a technological leap would be needed to achieve this? Would it make outer solar system missions possible...

I tried calculating the mass of the core of the sun but keep coming up with a number that exceeds the entire mass of the sun. I used http://en.wikipedia.org/wiki/Sun" facts on the sun. It says the core of the sun extends from its center to .2 to .25 times it's radius. I used the number .225 as...

if a tunnel is bored through the centre of the Earth and a pebble is dropped into it then the pebble will do what ?...A)stop at centre...b)perform s.h.m.

why density of core of the sun is changing ? please give me brief explain with calculation

Hello all, I am trying to determine if my machine is 64 bit or 32 bit, according to this site: http://support.apple.com/kb/ht3696" the Intel Core 2 Duo I am using is 64 bit, but when I run the following code #include <stdio.h> int main(int argc, char **argv) { char c; int...

I was reading an article over the weekend that the Moon has evidence of a "final" volcano on it's "far side." I am working on something that suggests the Moon would be too small to have had volcanoes, and this didn't fit with my assumption. I then reasoned that based on size, and based on the...

How can random electron currents in the Earth's core create a ordered magnetic field? What makes a current in the Earth be north or south what is the difference between a north current and a south one? How come if the magnetic field is strongest at the centre of the planet how come where it...

Homework Statement Consider a simple model for the interior of the Earth: there is a spherical iron core with constant mass density ρ0 and radius a; outside the core is "rock" with constant density ρ1. Use these values for the densities: ρ0= 8.90×103 kg/m3 and ρ1= 3.80×103 kg/m3. The radius...

I cannot seem to figure this out. I know total core losses at 120Hz and 60Hz are 100w and 32w respectively for some unknown constant ac voltage. I can't seem to figure out how to go about finding core losses at other frequencies or separating eddy and hysteresis losses. Can anybody shed some...

What is the difference between them? Which of them is used in building websites and which of them is used in designing application for mobile phones and other systems?

If a small black hole were to fall into a star or brown dwarf, presumably it would initiate accretion and fusion in a shell around it. Can such an object be stable over any decent timescale, or would it undergo variability/significant mass loss/supernova?