Loop Definition and 1000 Threads

Hi everyone, Say I have a 2D one loop integral of the form $$ I^s_n(\Delta)=\int d^2 l \frac{(l^2)^s}{(l^2-\Delta)^n} $$ Using that ##1 = \frac{1}{2} \partial_\mu l^\mu##, I can relate say $$I^1_2(\Delta)=I^0_1(\Delta)$$ + total derivative term. In dimensional regularization one usually...

I'm somewhat new to Matlab and am having issues with a nested "for" and "if" loop. My code is below. This code is combining a binary signal with a cyclic one. I'm trying to create a matrix with the amplitude condition in the first column and in the second column I want the sum of the number of...

While programming to find the largest prime factor for a composite number i came across a problem that if the number taken as input exceeds a certain limit, the loop time turns out to be a very long one and some times even resembling the time taken by an infinite loop.The method used for finding...

Hi, I have a matrix for instance as follow: A=[0.087 11.43 17.14 22.86 28.57 34.29 40.00 45.72 51.43 57.15 0.174 5.671 8.506 11.34 14.17 17.01 19.84 22.68 25.52 28.35 0.261 3.732 5.598 7.464 9.330 11.19 13.06 14.92 16.79 18.66 0.349 2.747...

Hi, Please assist, I write this MATLAB function and receive the error below function f=myfunn(z,x,K,L1,L2,phi) for c=1:3 f=z(c)-(x(2,c).*K(c).*L1)-(x(1,c).*phi(2,c).*L2)./phi(1,c); end function f=myfunn(z,x,K,L1,L2,phi) | Error: Function definitions are not permitted in...

Homework Statement A 330 kg roller coaster car sits on a horizontal track. Ahead of it is a vertical loop with radius of 6.85 m. The car is given an initial speed of 23.4 m/s and the car successfully traverses the loop. What is the maximum amount of energy taken away from the car by friction...

Hello, I want to write an inner loop which takes values based on the variable values of the outer loop. For outer loop, m=1, Nmax and for inner loop, I want n to take values from 1 to Nmax-m. But I am not sure if I can directly specify n = 1, Nmax-m. Also I want to use Nmax-m value for one of...

The problem is an experiment has been conducted where a solenoid current loop is matched to a current balance loop; the experiment was to determine the relationship between the current though the solenoid and the uniform magnetic field produced in the solenoid. one element of the experiment was...

I have problem with for loop in Mathematica given in the notebook attached. It evaluates only first step and then shows problems and the kernel could not stop running. What could be the problem? What is the correct syntax?

Hey, The question concerns a basic solenoid with an oscillating current, we have a loop inside with a particular resistance and we want to determine the current induced in this particular loop. The question is in the image below: Right, well it tells us to determine the electromotive...

Hey, My question concerns the integration of the biot savart law of a differential magnetic field element to find the magnetic field at the center of a square loop. The question is part (c) (using info from (b)) of the image below: I want to check if what I did was right, but what I...

The May 2012 "discrete symmetries" paper arXiv 1205.0733 signals a reformulation getting under way, I think. I'm curious to know how other people read this. There's been a pattern of the theory getting a major overhaul every 2 years or so. Many of us remember the 2008 reformulation, symbolized...

Homework Statement Snoopy is flying his vintage warplane in a "loop de loop" path being chased by the Red Baron. His instruments tell him the plane is level (at the bottom of the loop) and traveling at 180 km/hr. He is sitting on a set of bathroom scales that him he weighs four times what he...

Homework Statement An 80-kg pilot flies a plane in a vertical loop. At the top of the loop, where the plane is completely upside-down for an instant, the pilot hangs freely in the seat and does not push against the seat belt. The airspeed indicator reads the 110 m/s. What is the radius of...

If B~1/r2, then if we have a simple loop, B near the inner edge of the loop will be infinite (or close to it). Why then, would our flux not be infinite? I also get infinity if I take ∫ ∇ X A *da =∫B*da =∫(closed)A*dl Since A ~1/r and r~0 at the limit of our surface integral. I know I am...

Homework Statement A current I is flowing in a square wire loop of side a. Find the approximate value of the magnetic field intensity magnitude at the point P, which is near to one of the corners in the plane of the square at the same d distance from the near two sides! (d<<a). Homework...

Homework Statement ε[1]=12v internal resistance[1]=.016Ω ε[2]=12v internal resistance[2]=.012Ω some unknown resistance 'R' in a stand alone resistor. a) what value of 'R' will make the terminal-to-terminal potential difference of one of the batteries zero? b) which battery would it be...

Homework Statement A roller coaster is moving past the top of a loop of diameter 14m. The Normal force (directed downwards) provided by the track at the top of the loop is equal to one-half the [B]weight[B] of the car. What is the speed of the coaster car at this point?Homework Equations Only...

Hello, calculating the magnetic moment of a current loop is trivial, but I want to do it with the general formula \vec m = \frac{1}2 \int \vec r \times \vec J(\vec r) d^3\vec r The only thing which is stopping me is to find a good argument on why \frac{1}{2}\int \vec r d\vec r = \vec A where...

Hi guys, i'm looking at one-loop calculations in terms of helicity spinor (basically a paper by Brandhuber, Travglini and others) language but i have no idea how to integrate them :) For instance \int FeynParam\int d^D L \frac{\langle a|L|b]^2}{(L^2-\Delta^2)^3} How would I do...

Hi, Please I need your assistance on this MATLAB code. I will really appreciate it. R=0.492; Pw=0.3708; for r=1:5; for teta=10:10:360...

Hi, If I take an enclosed superconducting wire loop, and apply a time dependent magnetic field in the space enclosed by the wire ( and therefore a time dependent magnetic flux) , this should induce electromotive force ( according to faraday's law). However any potential difference should not...

A square loop carrying a current I creates its own magnetic field. Describe the forces on each side of the square loop due to its own field. What is the torque it experiences? My question is this. I know we can use bio savart. But for bio savart, B=uoI/2piR, what R do I use? suppose i have a...

Homework Statement A simple loop of 5 cm radius encompasses the middle turns of a long coil. The coil has 2500-turns, is of length 1 m and radius 1 cm, and carries a current of 10 Amps. What is the magnetic flux through the single loop? Homework Equations B=μIN/L with L=1: B=μIN...

Homework Statement A wire loop with radius R is located a distance d from a long straight wire carrying a current I. Find the flux through the loop. Homework Equations B = \muI/(4\pi) Magnetic Field above wire \phi=B*da*cos\vartheta The Attempt at a Solution Somehow you have to...

Long story short I have an integral which is something like this: (in Mathematica code) Integrate[1/{(1 - b^2)*{((1 - y)*z + y)^2 + (1 - y)^2*(1 - z)^2} + 2*(b^2 + 1)*{(1 - y)*(1 - z)*((1 - y)*z + y)}}, {y, 0, 1} ] Written without assumptions. b is actually only in [0,1] and I think I...

[SOLVED] Rotating Square Loop in Constant B-field Homework Statement Homework Equations \epsilon = - \frac{d\Phi}{dt} \Phi = BAcos(\theta) = BAcos(\omegat) d\Phi = -BA\omegasin(\omegat) The Attempt at a Solution I'm trying to study for an exam and I've got this practice...

I am supposed to read from 2 text files containing numbers in ascending order, then output the all the numbers in ascending order to an output file, For some reason my output file is reaching an infinite loop it orders the numbers correctly but the last number reapeats forever. I am thinking it...

There is a natural way to formulate Loop quantum geometry as the dynamics of line defects in a flat vacuum. Just under 2 months ago, I attended a 90 minute seminar talk on this at the UC Berkeley physics department. Unfortunately that talk is not online, but we do have an earlier talk given last...

Hi I am attempting to calculate the mass of the W boson according to one loop energies using the equation, Mw2=(πα/GF√2)/sin2θw(1-Δr) where (Δr)top=(3GFMt2)/8√2π2tan2θw using values:- α=α(MZ)=(127.916)-1 GF=1.16634×10-5 sin2θw=0.23116 =>...

Lenz law problem wire and expanding loop Homework Statement The loop has current radius R the red bar moves at velocity V. The distance the wire is from the loop is d and the top of the loop is length l Find the induced emf and the direction of the current in the loop. Homework Equations...

Homework Statement electromagnetic field Homework Equations E=hv The Attempt at a Solution I know that t is the variable and h1 and h2 I and I2 are considered given all we are doing is doing the algebra set up but not sure how to show this exactly.?

Homework Statement THe problem is number 3 in the picture. Homework Equations The Attempt at a Solution Lens law changing magnetic flux through the loop not sure which way for each one little confused. Thank you

Homework Statement Imagine a pliable round metal loop that can expand or contract. In a region with a constant magnetic field B0 that is oriented perpendicular to the plane of the loop, suppose that the loop expands, with its radius growing with time as r = r0(1+at2). As the loop expands and...

Homework Statement 1. Find the current in each resistor and voltage at point Vx Homework Equations Using Kirchoff's rule and system of equation I found currents but I am not quite sure how to calculate voltage at point Vx. I am pretty sure I got the currents right. Is it Vx =...

Homework Statement A 0.69m long and 0.69m wide loop is moved at a constant velocity of 0.81m/s from a region of zero magentic field into a perpendicular constant magnetic field of 0.21T. Calculate the magnitude of the induced voltage in the loop while it is entering the B-field Homework...

Homework Statement I've obtained the node equations that's in the matrix for rows 1, 2, and 4. I got 3 as well but I'm not sure if my analysis was correct. http://img252.imageshack.us/img252/3151/nodeq.jpg The Attempt at a Solution http://img684.imageshack.us/img684/9803/dsc0010van.jpg So...

Homework Statement A circular loop in the XY plane of radius R and with current I moving in the counterclockwise direction. Compute B at (L,0,0) for L >> R0. Homework Equations Biot–Savart law dB= μ0I/4∏ *(dl X r)/r^2 The Attempt at a Solution I know that the B on the axis...

Homework Statement Which describes the magnetic flux through a section of a loop? A. It is a vector that is directed outward through the section. B. It is a vector that is directed inward through the section. C It is a vector that is tangent to the section. D. It is a scalar...

1. A small current loop of area A=0.0007m2 and moment of inertia I=6.6e-07kgm2 carries a current i=0.0045A with its magnetic moment perpendicular to the Earth's magnetic field. The magnitude of the Earth's field is B=4.2e-05T. What is the magnitude of the net torque T on the loop? Homework...

1. An infinite straight wire on the z-axis carries current I2=3.6A in the +z direction, upward. A rectangular loop is placed in the xz plane with its nearest side parallel to the wire a distance d=0.9m away. The loop has height (z-length) h=1.5m, width (x-length) w=1m, and carries a current...

Energy Dissipated in Loop (Magnetic Field)-- Please Help! Homework Statement What is the energy dissipated as a function of time in a circular loop of N turns of wire having a radius of r and a resistance of R if the plane of the loop is perpendicular to a magnetic field given by...

Homework Statement A small current loop of area A=0.0008m2 and moment of inertia I=6.9e-07kgm2 carries a current i=0.0039A with its magnetic moment perpendicular to the Earth's magnetic field. The magnitude of the Earth's field is B=4.2e-05T. a). What is the magnitude of the net torque T on...

I want to plot a 3D graph. A solid graph and a wireframe mesh graph. What are the different ways to do it in this script. The variables i want to be plotted in this script are 'pic' 'TSFC' 'NonFs'. Dont mind the working, everything is correct. The only matter of concern is the 3d graph and...

Homework Statement A square loop, with sides of length L, carries current i. Find the magnitude of the magnetic field from the loop at the center of the loop, as a function of i and L. Homework Equations B=μ0/4∏∫i * dl X r^ /r^2 The Attempt at a Solution

Homework Statement A current-carrying circular loop of radius R is placed next to a long straight wire, as shown in the diagram below. The current in the straight wire points to the right and is of magnitude 3 A. see diagram...

Homework Statement A loop of wire is connected to the terminals of a battery. See Diagram: http://www.webassign.net/walker/22-35.gif The A terminal is of higher voltage, so the current travels clockwise from A to B through the loop. If you have the ability to send whatever current you like...

Magnetic Force on Various Sides of Spinning Loop?? Homework Statement A horizontal uniform magnetic field of magnitude 0.4 T is oriented at an angle of = 65° relative to a line perpendicular to plane of a vertical, rectangular loop, as indicated in the figure. The loop has a height of 8 cm...

Homework Statement (see attached file) Homework Equations (see attached file) The Attempt at a Solution isbn=input('Enter 9 Letter ISBN number: ','s'); for i=1:1:length(isbn) (%indent)num=str2num(cat); (%indent)check=num*i %somewhere in...

Homework Statement A rectangular loop of wire with dimensions 2.32 by 7.91 and resistance 0.557 is being pulled to the right out of a region of uniform magnetic field. The magnetic field has magnitude 3.01 and is directed into the plane of the following figure . At the instant when the...