Loop Definition and 1000 Threads

Okay guys I have an hour and thirty minutes before my exam; I know how to do the top problem; just use the formula B = mew x current/(2 x pi x r) then add the magnetic fields and use the right-hand rule to get direction, but I'm stuck on the bottom one.

Homework Statement A rectangular conducting loop of wire is approximately half-way into a magnetic field B (out of the page) and is free to move. Suppose the magnetic field B begins to increase rapidly in strength. What happens to the loop? Homework Equations Not sure which ones are relevant...

Mod note: Added code tags 1. Homework Statement in my main I am getting infinite loop iterating over a link list Homework EquationsThe Attempt at a Solution /* * graph.c * * Created on: Oct 8, 2015 * Author: danif */ #include <stdio.h> #include "IntList.h" int main(void) { typedef...

Thank you for opening this Thread I am kind of new here and this is my first time to post so I apologize if I did something wrong So my question is where can I study/ research Loop Quantum Gravity I have checked fair amount of grad school websites and compared to Super String, I have not yet...

Homework Statement https://physicsforums-bernhardtmediall.netdna-ssl.com/data/attachments/72/72755-bc8e4b32405460abcfa2d8e4880f7037.jpg I'm trying to figure out the terminal velocity of the loop as it falls through the magnetic field (figure 7.20). 3. The Attempt at a Solution The...

So, this seemed really fun to me until I got stuck. THE TASK is about an object with mass m, moving in a basic (2D) coordinate system. It is attached to origo (0, 0) by a "rope" with constant length r=5. In position P0(-5, 0) it has the velocity v0=[0, -10]. Hence, the object moves around origo...

So I had this question for physics about something going around a loop. The question asked what the minimum velocity to counteract gravity is if something is going around a loop. hint: One force will be zero. I'm not sure how to figure this out, can someone help?

Please help how Ve is calculated what i think is that it should be: -Ve=-Vee+IeRe; How Ve is taken positive please someone draw equivalent circuit for same

A critique of LQG here: "The next step in the construction of LQG is to decide what the dynamics are. Technically, this is done either (A) by choosing a "Hamiltonian constraint" in parallel with the Hamiltonian formulation of GR, or (B) in the spin-foam formalism, by postulating some sort of...

Hello, i have a really annoiyng problem , i have a robot which is equipped with a video camera(PAL) so nothing too fancy, the information is transmitted through a coaxial cable about 200 m of cables,the attenuation of high frequency is not to big to cause any problems,also the robot has some...

Hi All! I have heard that loop quantum gravity is a "background independent" theory, in that there is no preferred coordinate system. Is LQG also a Machian theory?

Let's consider the Magnetic hysteresis loop of a certain material: https://www.nde-ed.org/EducationResources/CommunityCollege/MagParticle/Physics/HysteresisLoop.htm is an example. In many sites and books it is written that its area is proportional to the energy wasted as heat, so A = kE_d. In...

I've inherited the code below. It's giving an infinite loop but I can't find what's causing it. This is code originally on OpenVMS written now for AIX. Can you help? SUBROUTINE MREAD3(N_VESSEL,N_TRIP,N_ICNAF,N_SPECIES,N_DELSTR, + N_SETDEL,N_SELSTR,VESSELS_TO_BE_SELECTED, +...

hello, i need to uniqly identify up to 10 (or maybe more) different objects passing a 4x4m big gate with 200km/h speed. right now we use an IR transmitter and reciever, but the problem is, one can hardly say for sure if the transmitter 100% passed though the gate, or just next to the receiver...

Homework Statement A semicircular loop of radius a carries positive charge Q distributed uniformly... Find the electric field at the loop's center (point P in the figure). Hint: Divide the loop into charge elements dq as shown in the figure, and write dq in terms of the angle dθ, then...

Hello, today our teacher told us that on tomorrow's test there is going to be a problem where you drop a mass on a slope which connects into a loop. The point of the problem is to calculate exactly how tall the slope must be for the mass to complete exactly one course through the loop...

I read the following problem on a textbook: A airplane flies at a constant speed of 680m/s perpendiculary to Earth's magnetic field (of 5x10^-5 T). The wingspan of the airplane is 9.8m. What is the induced voltage? The answer the book gives is: E = BLv = 0.4066V But I've been wondering if this...

First time here. I browsed around a bit, but did not see a topic quite like what I am about to write, so I started a new topic. If I missed an existing topic, please point me to it, and I will thank you for doing so. Please select a prefix? I seem to remember some of this from High School...

Suppose we have an elliptical loop of wire in the x-y plane with constant cross-section. And let's also assume that the cross-section is very small, so we have a thin wire. $$\vec{r}=\begin{bmatrix} x \\ y \end{bmatrix}=\begin{bmatrix} a\cos \theta \\ b \sin \theta \end{bmatrix}$$ A tangent...

Homework Statement How to calculate the magnetic field at the centre of a circular current (I) loop of radius r using Ampere law Homework Equations B = μ0I/2r The Attempt at a Solution I take circulation along the circular closed path of radius r passing through the center of the loop and...

Hi, I'm trying to write the current density for such circular loop in spherical coordinates. For a circular loop of radius a that lies in the XY plane at the origin, the current density it's simply: \mathbf{J}= \frac{I}{2\pi\sin\theta}\delta(\theta-\frac{\pi}{2})\frac{\delta(r-a)}{a}\hat{\phi}...

Homework Statement This is a question me and my friend were wondering about. How can one calculate the magnetic field due to a current carrying loop at a point in the area enclosed by the loop. For example, at point P as shown in the attached figure. Homework Equations $$B =...

Hi there! I was wondering if anybody knows what package or software CERN of other particle accelerators use to calculate their theoretical predictions. I need specifically tensor loop integrals of up to rank four and of three and four vertices. Thanks!

I've been making a go at writing out algorithms myself in MATLAB rather than using pre-existing code. I've just attempted to write the Nelder-Mead optimization method and I have hit a stumbling block where the code is now looping infinitely. It seems to have something to do with sorting the...

is there a generally accepted candidate Hamiltonian for LQG? i've seen marcus post these papers recently http://arxiv.org/abs/1507.00986 New Hamiltonian constraint operator for loop quantum gravity Jinsong Yang, Yongge Ma (Submitted on 3 Jul 2015) A new symmetric Hamiltonian constraint...

Homework Statement A square loop PQRS carrying a current of 6A is placed near a long wire carrying 10A as shown in the figure. Find the magnetic force on the square loop. Homework Equations F = B * i * l ...... (1) B = (µ0 * i)/2 π r The Attempt at a Solution I tried finding out the...

Here is my misunderstanding , for the example let's ignore resistance losses , say i have a infinite length of coil , and an infinite strip of magnets passing through that coil, each magnet separated by some distance from the next one , the strip of magnets move through the middle of the coil ...

This question was posted on Khan Academy. I attempted it after watching all of their great Work and Energy videos, but the way they arrived at the answer was way above my skill level even after reviewing the videos a number of times. Here is the question: What is the minimum height h of a slope...

Homework Statement Hi, I am studying covariant LQG from the recent book by Rovelli & Vidotto, and i am struggling with the linear simplicity constraint. My problems are not with its proof, that i understand, but rather with the physical interpretation in terms of boost generators. I will try to...

implicit none character*4 head1,head2,ext character*10 fn1,fn2 integer i,kev head1='jack' head2='jill' ext='.dat' do i=1, 50000 kev=int((i-1)/50)+1000 if(mod(i,50).eq.0) then write(fn1,'(a,i4,a)') head1,kev,ext write(3,*) fn1 write(fn2,'(a,i4,a)') head2,kev,ext...

Hello. As far as I know, every circuit capable to flow current must be closed. In other word, open circuit can not flow the current, obviously. Right now, I would like to know this is also true for lighting in bad weather. When bottom of the dark and heavy cloud get more and more electron by...

Homework Statement There is a counterclockwise current I in a circular loop of wire situated in an external magnetic field directed out of the page as shown. The effect of the forces that act on this current is to make the loop Select one: a. expand in size X b. contract in size c...

I've written a code which reads in an input file and extracts a number which represents a grid size, from lines in the file which can contain arbitrary characters. The extraction of the data seems to be working, but for some reason the loop executes 4 times and then moves on to the next...

if conformal gravity is a successful research program, what would its implications be for loop quantum gravity? can conformal gravity be loop quantized? can loop quantum gravity be made to respect conformal invariance? or are the two mutually exclusive?

I would like to ask about the case of: ##SU(2)\otimes U(1) \rightarrow U(1)\otimes U(1),## spontaneous symmetry breaking. It is given that the Wilson Loop: ##W \equiv exp[ig \oint dy H T^1]= diag(−1,−1,1).## Where ##y## is the ##S^1/Z^2## fifth/extra dimension, ##H = \frac{1}{g R}## and...

Given a flexible wire loop of a certain perimeter and planar shape, what are some good ideas to minimise the loop's inductance? For example, would it work if i surrounded the wire loop with a superconducting loop in the same plane?

I need some help in optimizing a code with a prompt yes/no...My problem is that if I mistype within the loop for r some character (let's say I'm missing the number 8 on the keyboard for u) the program gets into an infinite loop. Do you know some way that I could solve this problem? Like printing...

Homework Statement The wire loop ##ABCD## is in a magnetic field of the long thin rod magnet with a magnetic moment per unit volume of ##\mathfrak{M}_0## and a cross section ##S##. The north pole of this magnet is in the center of the loop, and the magnet is perpendicular to the plane of the...

Homework Statement Problem 6.2 of Griffith's "Introduction to Electrodynamics": Starting from the Lorentz force law ##\vec F=\int I (d\vec l \times \vec B)##, show that the torque on any steady current distribution (not just a square loop) in a uniform field ##\vec B## is ##\vec m\times \vec...

Homework Statement [/B] 3. A square loop of area a 2 is formed from a single turn of thin wire of resistance R. The loop is aligned with two sides parallel to an infinite straight thin cable, with its closest side a distance r away, and is given a velocity v in a direction perpendicular to the...

Does anyone know a simple explanation for the following statement: Gauge invariance ⇒ $Πμνϒϒ(0) = ΠμνϒZ(0) = 0$ Where ΠVV' is the V to V' one loop correction, ϒ is the photon field and Z is the Z-boson field. The argument of Π is the incoming momentum q2 = 0

It is my general understanding that according to KCL, current requires a closed loop to flow in DC. However, this is apparently not true in AC; current doesn't needa closed loop to flow. I have drawn a circuit below which causes confusion: C1 is a charge capacitor, R1 is a resistor, I1 an...

Homework Statement Homework Equations I have some equations relating B to I but I don't really know if they are useful The Attempt at a Solution I actually don't even know where to begin on this, my notes are confusing and vague :(

I am trying to calculate the average speed of a car while traveling around a loop de loop in m/s and km/h can anybody help? Thanks

as u know torque is given by NI(A X B) where N and I are number of loop turns and current magnitude respectively, A is area in vector and B is magnetic field in vector. regarding the direction of area : what normal to take as a direction, is at that which makes acute angle with magnetic field...

Homework Statement An elastic circular loop in the plane of the paper lies in a 0.81 T magnetic field pointing into the paper. If the loop's diameter changes from 19 cm to 6.8 cm in 0.45 s, a. what is the magnitude of the average induced emf? b. If the loop's resistance is 2.3 Ω, what is...

I am planning to build a rogowski coil but not the conventional one, which is a circular loop. Below is the example of a rogowski coil so you have the big picture of my question. In the picture, the current conducting wire (with current Ip) is encircled by a big circular loop rogowski coil...

Homework Statement A rectangular loop of wire is placed next to a straight wire, as shown above. There is a current I in both the straight wire and the loop. The dimensions shown in the figure are a, b = 2.2a, and c = 8a. What is the magnitude of the force on the loop? Express your answer in...

I'm trying to derive a formula for the magnetic torque on a semicircular loop. what I've done so far is this The magnetic force on the non-curved loop is $\vec{F}_{x}=\int Idx\hat{i}\times B_{\circ}\hat{i}=0N$ for the curved loop $\vec{F}_{c}=\int_{0}^{\pi} Ird\phi\hat{\phi}\times...

Dear Friends! I need to find roots of polynomials with variable coefficients, The command I used is w=0:50 A=w^2 B=w^3+2 C=w+2*w^2 D=w E=w./2 ss=[A B C D E] xi=roots(ss) by this I find all the roots of equation, I want to find velocities by setting v1=w/xi(1) v2=w/xi(2) v3=w/xi(3) v4=w/xi(4)...