Loop Definition and 1000 Threads

It is possible to introduce the gauge field in a QFT purely on geometric arguments. For simplicity, consider QED, only starting with fermions, and seeing how the gauge field naturally emerges. The observation is that the derivative of the Dirac field doesn't have a well-defined transformation...

Where i work has a chilled water loop to every building for the ac system. A rooftop unit has not been performing as it should so we are investigating into the possible causes. Right now i am trying to come up with the different variables that accompany the givens. I know the pipe is 2.5", the...

The scenario is the following, I am given 2 loops with the same radius, r, a distance of d, and same current of I. In the left loop the current goes counter clockwise, in the right loop the current is clockwise. The two loops centers lie on the same axis which are perpendicular to the plane of...

The scenario is the following, I am given 2 loops with the same radius, r, a distance of d, and same current of I. In the left loop the current goes counter clockwise, in the right loop the current is clockwise. The two loops centers lie on the same axis which are perpendicular to the plane of...

http://arxiv.org/abs/1408.0121 Thermally correlated states in Loop Quantum Gravity Goffredo Chirco, Carlo Rovelli, Paola Ruggiero (Submitted on 1 Aug 2014) We study a class of loop-quantum-gravity states characterized by (ultra-local) thermal correlations that reproduce some features of the...

Homework Statement A loop of wire with an area 1cm^2 is centered within a larger loop of area 1m^2. Apower supply is generating current through the larger loop described by the function: I(t) = 40A * cos(2t/s * 2pi/5) Calculate EMF at time t = 3sHomework Equations Magnetic flux =...

Consider a circular loop of radius R that carrys a uniform current I. We know(by Biot-Savart law) that the magnetic field it produces on its axis is given by \vec{B}=\frac{\mu_0 I R^2 \hat z }{2(z^2+R^2)^\frac 3 2} . But let's calculate its vector potential: \vec{A}=\frac{\mu_0}{4\pi} \int...

If one has a 4-fermion vertex, like in Fermi theory : ##G_f (f_1 \Gamma f_2)(l_1 \Gamma l_2)## And you are calculating a one-loop diagram where you have the diagram of : f1-> f2,l1,l2 -> f1 (used for dispersive/unitarity approach) Where in the end you'll use Cutkosky rules to calculate...

Homework Statement Find the electric field a distance z above the center of a circular loop of radius r that carries a uniform line charge λ. Homework Equations $$E=E_r\hat{r}+E_z\hat{z}$$ $$E_r=\frac{\lambda}{4\pi\epsilon_0}\int_0^r\frac{1}{\mathcal{R}^2}\sin{\theta}\,dr$$...

Hi, i need to calculate the minimal velocity at point A to reach point B Not asked to complete full loop, There is no friction. I guess (mv^2)/2 = mg*2r >>> v = sqrt(4gr), my friend say v = sqrt(5gr) Thanks.

hi my dear friends i face with a problem in ansoft maxwell; i want to import a hysteresis material's loop into maxwell's material s libraray but i cant!:( is there anyone who can help me? with the best wishes:) pedro

Homework Statement Write code using a while loop that will assign to the variable numOccursSep the number of times a certain pattern of 0's and 1's occurs separately in V. The variable pattern gives the certain pattern to look for. For this problem overlap is not allowed, i.e. if pattern =...

Hello, I'm new to this forum. I hope I am submitting this to the right thread. Just started physics and I am looking to get a little assistance Homework Statement A single loop carries 100mA and has an inductance of 100μH Homework Equations For air cored L = μ0 * (N^2*A/length) L = Nø/i...

Hey Guys. I've been spending the last 1½ week trying to figure this out on my own, but I just can't find the answer. A car (toy car) weights at about 0,062 Kg, and enters the loop at the speed of 0,60 m/s. The radius of the loop is 0,2011 m. Find the speed at the top of the loop (Not...

Hello! As a new past time I wanted to learn some coding. A friend of mine wrote a program and explained it from A to Z to me, it took like 2 hours. I wanted to play a bit with the program by modifying it. Here's the code: #include <stdlib.h> #include <iostream> #include <time.h> using...

Can anyone tell me if Control bandwidth and closed loop bandwidth means the same thing? If not what does control bandwidth mean? Please & Thank you!

Hello here is a problem that we want to find induced voltage in two different questions. 1-here is part (a) solution: question 1:why we get integral in all space of conducting rail instead of bar space?(Area of bar)for example if we enlarge the space and set bar fix again induced voltage...

Homework Statement There's a magnetic field B in +\hat{z}. A rectangular loop is lying in the xy-plane. Three sides are static, the 4th one is moving with velocity v along the direction of +\hat{y}, making the rectangular larger and larger. The length of this moving side of the rectangle is L...

Homework Statement You have a loop of wire (dimensions c and d) which is oriented vertically on the y-axis (the y-axis splits the rectangle in two equal pieces), and rotates about the y-axis at constant angular ##\omega##. The magnetic field is in the +i direction. What would be the torqque...

If a pump pumps water to a heat exchanger at a certain height, say, 20 m is the head required indeed lower for a closed loop system than an open loop system? The link below says so, but I wanted to verify. Assume pipe friction losses are the same in both cases. Can one really take credit for...

public static int function(int n, int a, int b){ if (n>0){ if(b==0) return a; else return function(n-1,a,function(n,a,b-1)); } return b; } I have a recursive function of this form, how do I convert it to a loop?

Homework Statement http://web.mit.edu/viz/EM/visualizations/coursenotes/modules/guide10.pdf pg: 10-17 Homework Equations The Attempt at a Solution I do not understand conceptually, why we chose the rectangular surface to take the flux over. Can anyone explain this...

Hi all, Thanks in advance! I'm almost new in Fortran, and I'm having some troubles with a Fortran program. I've some input data files named with numerical values like "Input_A=0.00_B=0.00" "Input_A=0.10_B=0.01" "Input_A=0.20_B=0.02" "Input_A=0.30_B=0.03" "Input_A=0.40_B=0.04" ... ...

Hi Let's look at this: The issue I am having is that while I know that this is accurate: I just cannot wrap my head around why. I1 is a result of both voltage sources. So, while the equations clearly tell me that the voltage drop across the resistor R1 is I1R1, I cannot wrap my...

Homework Statement 1) A mouse of mass ##m## runs around the inner circumference of a vertical circle which is free to rotate about its centre. The mouse starts at the bottom of a stationary wheel. Let ##\phi## be the angle that the radius vector of the mouse makes with the downward vertical at...

My textbook says that at the center of a square conducting wire of length ω, the magnetic field is: B=\sqrt{2}μ_{0}I/(\piR) I am not sure how to calculate this...? Because the Biot Savart law has a closed loop integral, we do not use piecewise addition of line integrals to find the...

Homework Statement The conducting rod ab shown in the figure (Figure 1) makes contact with metal rails ca and db. The apparatus is in a uniform magnetic field 0.800 T, perpendicular to the plane of the figure. If the resistance of the circuit abdc is 1.50 Ω (assumed to be constant), find...

Plotting results from "for" loop Hello, I have a problem which it seems I couldn't solve. I have "for" loop which gives results of some calculations as, say, vectors with two coordinates. What I want is to plot the result as a point in the xy plane. This loop goes on and on with the...

I am trying to convert a FORTRAN version of a Canonical Correlates program listed in Multivariate Morphology - Blackith and Reyment. I've programed in FORTRAN decades ago and now I have to understand the language to rewrite the program into PERL. a) DO 260 I = 1 , M b) SX( I ) =...

Homework Statement Hey guys, I have a physics II test tomorrow on Electricity and Magnetism, and I cannot seem to figure out this question. The rectangular loop in the figure has 2.2×10−2Ω resistance. What is the induced current in the loop at this instant? Picture: Homework...

Is the term "loop" loosely defined in Faraday's law? A voltage will be induced in a loop of wire when the magnetic field flux through the loop changes If you're reading this, you probably know what happens when you hook up the leads from an oscilloscope to a microphone. Nothing, lol. There...

Problem: A little roller coaster (see attached image) is at a certain height h and starts moving downwards, Neglecting the friction and drag. From what height does the coaster have to start in order to complete a full loop with radius a without coming of the track? h should be expressed in a...

I am reading an input file that has blank lines. x reads character by character. x is equal to a new line so it goes into the while loop but skips the if x == '\n'. It's suppose to go inside the if statement but it doesn't. I tried debugging the code and printed out to double check x is holding...

Homework Statement A uniformly conducting wire is bent to form a ring of mass m and radius r, and the ring is placed on a rough horizontal surface with its plane horizontal. There exists a uniform and constant horizontal magnetic field of induction B. Now a charge q is passed through the ring...

t = (0:0.0001:10); for ki = [0.625, 1.125] kp = 1.25; H = tf([0, 0, 2*kp, 2*ki], [1, 3, 2 + 2*kp, 2*ki]); step(H, t) for i = [1, 2] di = stepinfo(H) end hold on end legend('kp = 0.625', 'kp = 1.125'); I want the di loop to return d1 = all the data and d2 = all...

If the loop is rotated in the opposite direction by the same amount, which change in magnetic flux is true? (Select all that apply.) a)It has the same magnitude. b)It has a smaller magnitude. c)It has the same sign. d)It has a larger magnitude. e)It has the opposite sign.

Which do you think are the most promising alternatives?

This is a question I got wrong on a test and would like to see if I can get someone to show me how to do it properly. Snapped a pic . See below please. Thanks.

Homework Statement A copper wire loop is initially at rest in a uniform magnetic field (full flux going through it). Between times t=t1 and t=t1+(delta)t the loop is rotated about a vertical axis as shown (no flux going through it). Will current flow through the wire of the loop during this...

Homework Statement Problem in attachment. Homework Equations The Attempt at a Solution Unfortunately I was unable to attend my only class where my proffessor taught this method of solving area. Plus my prof and classmates won't help me. Does anybody know how to solve area...

I have this assignment (First problem - exercise 2 - dias 7) http://site.iugaza.edu.ps/bhamed/files/2010/02/L4-Root-Locus.ppt Which i am having some problems solving. I am stuck at B) So far i tried to solve the problem, by calculating the distance from origin to the breakaway point, by...

Hello everyone, I want to have a simple example of an inductance calculation. The magnetic field normal to a filamentary circular current loop is not constant over the circle but if we approximate the value as that for the center, multiply by the area of the circle and divide by the current...

I need a general rule of thumb or simple formula to determine the minimum radiius required for an experiment. I have a 2.4GHz remote control car that reaches about 45 mph. If I begin at a certain distance from the loop at ground level, how large will that loop need to be? The car measures 19"...

The question is to find the magnetic field at the centre of a current carrying circular loop of radius R, where the current = I Okay so I'm trying to do this by both Amp's Law and Biot Savarts Law, and I can't get my answers to agree. First method - Biot Savarts Law...

Homework Statement Determine the emf induced in the square loop in the figure if the loop stays at rest and the current in the straight wire is given by I(t)=(15.0A)sin(2500t) where t is in seconds. The distance a is 12.0 cm, and b is 15.0 cm. Homework Equations emf = Δmagneticflux/Δt...

Homework Statement Calculate the magnetic field above a loop shown in picture with radius ##R## and current ##I##.Homework Equations The Attempt at a Solution Firstly, curved part: ##\vec{H}(\vec{r})=\frac{I}{4\pi }\int \frac{d\vec{{r}'}\times...

Homework Statement (Challenge Problem 80, Ch33) A rectangular metal loop with 0.050 ohms resistance is placed next to one wire of the RC circuit shown in the below figure. The capacitor is charged to 20 V with the polarity shown, then the switch is closed at t = 0s...

How the charge is conserved in a closed loop circuit?

Homework Statement An N-turn circular coil of radius r with a total resistance of R is placed such that the normal to its plane is parallel to the +z axis. A uniform magnetic field varies with time according to B=B0sin(\omegat) where the amplitude B0 and angular frequency ω are constants...

Homework Statement The wires below are infinitely long and some of them are with loops and semi loops. The current I is constant. What is the magnetic field in point O, when R is the distance from it? Questions: In F, E and H, the magnetic field exerted by the terminal infinitely long...