Loops Definition and 275 Threads

hi i have some crazy ideas about tornadoes,lightning and storms emitting magnetic flux loops interacting with the Earth's own magnetic properties and do not have enough electrical schooling to know if it is even a possibility. i was hoping i could get a more learned opinion. the thread is...

Dear all, I would like to estimate the inductance of a rather arbitrarily shaped coil composed of multiple single loops. For example, I am wondering about the inductance of sandglass like coil which has many turns at the edge and less in the middle. The inductance of a single loop seems to...

I am a medical student and I'm trying to find a good program that will allow me to draw PV loops like this: http://cvphysiology.com/Cardiac%20Function/CF025.htm I know in physics there also PV loops, so I thought someone might have a recommendation of a piece of software that would allow...

23. Feedback loops a) As carbon dioxide levels increase in the atmosphere more outgoing infrared energy is absorbed which increases air temperatures and therefore ocean temperatures. As ocean temperatures increase carbon dioxide is released to the atmosphere because less carbon dioxide can be...

Homework Statement Write a program that does the following: Prints the four gases on the screen and asks the user to select which gas to find the heat capacity for. Asks the user for a temperature. Asks the user if another temperature is needed (enter yes or no). If the answer is yes...

Homework Statement I'm to write a program that calculates GPA using loops to allow numerous inputs and using Error checking to be sure that inputs are valid. I'm having trouble figuring out how to make my loop repeat if a the input is invalid. And I'm also having a little trouble with the...

[b]1. Homework Statement [/b Here is a question on proof of partial correctness with 2 while loops with Hoare logic {True} z:=1 m:=x n:=y while (n=!0) do while (even(n)) do m:=m*n n:=n/2 n:=n-1 z:=z*m {z=x^y} Homework Equations The Attempt at a Solution I...

Does anyone know of solutions (or sources showing them) to the area and line lengths of the loops and arcs of prolate cycloids? Standard cycloids are well discussed online, but equations relating to looping cycloid curves appear absent. I have not seen an equation relating to either loop area or...

A while back, Tom asked me for a report on where the Loop program stands and I didn't give a clear answer. In the meanwhile several other people have expressed interest in what the current status of LQG is. It has become a little clearer recently because abstracts of the talks being given at the...

Loops 2013 opens at Perimeter a couple of weeks from now and abstracts of some of the invited talks have been posted. Reading the abstracts can give an idea of the main trends in current QG research. It's also interesting to see who the invited speakers from outside are and what they will be...

In conventional renormalization one is first supposed to compute a scattering amplitude of interest in terms of bare quantities ##\lambda_0, m_0...##, then compute these bare quantities in terms of physical quantities, i.e. ##m(m_0,\lambda_0,...), \lambda(m_0, \lambda_0,...)## and substitute...

Homework Statement In the figure ε = 15.1 V, R1 = 1560 Ω, R2 = 2130 Ω, and R3 = 4210 Ω. What are the potential differences (in V) (a) VA - VB, (b) VB - VC, (c) VC - VD, and (d) VA - VC? The figure consists of single ideal batter connecting to a diamond shape circuit ABCD. Going clockwise...

My code isn't working, and the reason seems to be because nested for loops in python don't work according to my expectations. If I have some code like this: f1 = open('name_of_file1.txt', 'r') f2 = open('name_of_file2.txt', 'r') for line1 in f1: #stuff at this level should happen...

Homework Statement I have an assignment for my thesis to make Hamiltonian for Schrodinger equation. I won't go into physics part of it, because that is well understood. I need to somehow generate a specific matrix for Hamiltonian (H). Please see the attached file of what I need to get...

The B field at the center of a stack of N circular loops each carrying current I is B = mu0 * N * I / (2a) where a is the radius of the loop, derived using Biot-Savart law. The B field inside a solenoid is B = mu0 * N * I / l where l is the length of the solenoid, derived using Ampere's...

I am working on a problem involving force between two loops of current. The problem is to prove the for any arbitrary loops of current, Newtons third law holds true. I understand the basics of the approach but I am having trouble seeing why a term goes to zero. The basic setup is to use the...

I was able to solve this pretty easily using mesh analysis, but what other ways can you use to solve this circuit? http://imageshack.us/photo/my-images/259/circuita.png/

Homework Statement http://imageshack.us/a/img823/5397/homeworktest2prob4.jpg Find the current i using superposition Homework Equations V= IR, KVL, KCL, Superposition procedures The Attempt at a Solution I' + I'' = i say I' then 7A source cut off say I''...

Homework Statement Question: Find the current in the circuit shown. http://i1307.photobucket.com/albums/s599/JustOn4Fun/PhysicsFigure_zps39d4c66d.png Homework Equations Not sure if equations are necessary since it's a question testing the use of the following rules: Junction Rule The...

Hi, Does anybody know a nice formula for the capacitance of two metallic wire loops with equal radius R? (The center of the loops are above each other, their distance is d. The whole system is in vacuum) Thank you!

Hello, This isn't a homework question, just a curious question. I've been working on problems involving Ampere's Law and slabs of current density J. I've drawn a diagram to illustrate my question: http://www.freeimagehosting.net/t748n Here, two infinite slabs of current are placed one on top...

Hi, The picture below is part of the notes given to us by our teacher. In case it doesn't work, it's a double loop with a voltage source on the left arm, a resistor (R1) on the middle arm, and two resistors in series (R2 and R3) on the right arm. all the resistors and the voltage source are...

I am currently reading a paper discussing the convexity of the image of moment maps for loop groups. In particular, if G is a compact Lie group and S^1 is the circle, the paper defines the loops group to be the set of function f: S^1 \to G of "Sobolev class H^1 ." Now in the traditional...

Given the following system of equations 3x1 + ax2 = 1 ax1 + 4x2 = 0 where -pi ≤ a ≤ pi. We would like to find out the range of values of x1 and x2 that are observed as a is varied. Do this as follows: 1. Create a for loop that uses the variable a as the indexing value, varied from over...

The Problem: Write a function that finds the factorial of a positive integer without using for or while loops, the factorial function, or the : range operator. Honestly, I don't really know how to start with this one. If I were able to use a for loop it would be easy, and I don't see how I...

Simple Generator - Calculating "N" Loops Homework Statement A simple generator is used to generate a peak output voltage of 26.0 V . The square armature consists of windings that are 6.3 cm on a side and rotates in a field of 0.440T at a rate of 60.0 rev/s. How many loops of wire should be...

var lost = [4, 8, 15, 16, 23, 42]; var count = lost.length; var isLost = function (n) { for (i=lost[0]; i<count; i=lost[i+1]) { if ( n === lost[i]) { return "true"; } } return "false"; }; is it possible to in corporate array positions into the for loop? (i) do...

Hello all, I am working on a Fortran90 code that will give me an approximation of a few mathematical constants. My code will compile and run, however, my outputs are given as 0.000000 for all constants that I am calculating in the loops. Any help would be greatly appreciated. My code is as...

If I want to make sum over graphs why I must have only loops? Why I must disslolving knots?

Hello All, I took it upon myself to create a tool for my job that xref 2 excel worksheets on 2 different workbooks. Customers send us parts and they're wanting the leadtimes for them. We have a weekly report that has all part numbers with their leadtimes. My goal is to create a GUI in C# that...

Is there an equation to find out the velocity of electrons and protons in a loop of plasma when a current is induced through it?Is the velocity just equal in magnitude and opposite in direction or is it opposite in direction and the velocity dependent on mass of the particles?(implying that an...

I want to generate a Poisson distributed vector of random numbers, without any of the numbers being 0. The code I have is k = poissrnd(kmean,1,N); % where kmean is the mean of the distribution, and has been defined previously %The above generates a N by 1 vector of Poisson distributed...

Homework Statement The mathematical formula that connects the magnetic field in a solenoid with the current is given by B=((μ0 x n)/(2πr)) i where μ0 = 4∏ x 10^-7 NA^-2 is the 'magnetic constant', n is the number of turns or loops of wire (unknown), r is the radius of the solenoid (0.023m)...

Hey guys, I have a simple conceptual question: Let's say I'm moving a loop of wire into a constant magnetic field that points into the page. The wire needs to create a magnetic field out of the page to oppose this previous change in flux. The typical question would be which direction does the...

I need an idea for a simple game in basic (i was told it can't be battleship for some reason) to program. I do not want whoever reads this post to give me the coding for it i am just looking for ideas. It must use loops, IF-THENs, and inputs and those 3 things are the only things it needs to...

Hi everyone, it has been a while since I used MATLAB, and I find myself in need of something that I hope is rather simple. I am making a surface plot of a function that is a little odd. To plot said function I would normally use meshgrid or something, but that will not work thanks to my...

Homework Statement Suppose you have three closed loops (ring-like) Each one has current going through it. They are set parallel to each other and the same distance away from each from each other. Suppose also the current through the one in the middle loop and the one on the right loop move...

Homework Statement There is a solenoid, with field B at its center, radius r, length L and maximum current I. Calculate the minimum number of turns the solenoid must have.Homework Equations Ampere's Law: (closed)∫B\cdotdl=\muI n=N/L Biot-Savart: B=\muIN/(2\pirThe Attempt at a Solution Solving...

Homework Statement Use an explicit leap-frog scheme for the following two governing equations describing head and velocity in a estuary system (time and x-direction) due to tidal forces and river flow. The length of the system, L, is 100 km. Both the depth, a, and the width, B, vary linearly...

Homework Statement This was a question on my lecture slides which I didn't quite understand during the lecture. Here is the circuit: http://img843.imageshack.us/img843/3548/nodesbranchesloops.jpg The question was to find independent loops in the circuit. On the left-hand side I drew in the...

Heres my problem, step one I've solved. Step two only ever returns the original newRoot*newRoo and I don't understand how to correct itTo demonstrate event controlled loops use arithmetic to create: 1.Create a sequence to determine the next largest perfect square 2.Create another sequence to...

I think I was told that current loops don't radiate even though we have accelerating charges. But why doesn't it radiate? Could we say something like the B field is symmetric and the electrons on the other side of the wire feel the presence from the other electrons. If I had a line current...

Homework Statement A 2cm diameter cylindrical solenoid of 10 loops and 20cm long is in a perpendicular magnetic field of 0.7Tesla directed away from you. The field increases to 2.7Tesla in 100ms. The loop has 8Ω. What is the EMF? What is the current? What is the magnetic field of the...

Matlab "solve" function in "for" loops I need to solve a similar problem like shown in the below codes for a larger matrix, The 'x' here needs to be solved for each y(a,b). Each of this y(a,b) is equal to zero and 'x' will vary accordingly , so it will give a 2by 2 matrix for 'x' as well...

I am trying to do some Newton's method-type stuff in Mathematica. I want to build a While loop that does the following: - Take input r. - Compute some quantity f(r). - Update the value of r to f(r). - Repeat until |g(r)| < C for some fixed constant C. The third (boldfaced) step is...

Hi. So I thought I understood PLLs pretty well after I designed a couple over summer, but I've just been taught them at university and I'm now pretty stumped! The lecture notes use Phasors which just make things confusing. I wonder if anyone could explain the 2 initial setup equations used in my...

[b]1.Find the voltage drop across each resistor? (I'll be able to do this after finding out the currents) I've had a go at the formulas but not sure if they're right I've never done 3 voltage sources before so the middle one is putting me off. Any help with the formulas would be great thanks.

I had a test in my computer science course in which I was asked if any while loop can be replaced with a for loop. I put true. I guess the answer was false. My professor said that if you had a while loop in which you asked the user to input a certain value that had to be within a certain...

I have a homework problem that I can't figure out, can someone help --Create a function called sums that will prompt the user to enter integer values (either positive or negative). The function should keep separate running totals of the positive values and the negative values. The user should...

Hi everyone, I'm new to programming, studying python in school. here's my first go at a loop to count up to 100 by 2, works fine stop_count=100 count=2 while(count<=stop_count): print count count=count+2 But one of my practice problems is to use 'while' to print 2 and all powers of 2...