Loop Definition and 1000 Threads

I haven't seen anyone derive the magnetic field density (B) using ampere's law, only using Biot-Savart Law any reason why? if we cut the loop and loop at one end (of the new cut) and treat it as if it was a current carrying wire, then by ampere's law we'd get: B = u*I / 2*pi*r but...

this is the E field above a square loop with side=a at distance z on the z axis. by symmetry the Ex, Ey field cancel out. it really kind of bothers me that I can't see this substitution, including the sin(tan^-1(u)) portion. I guess it's an easy technique but I wonder how you get the...

i know that a current loop creates some kind of a short bar magnet , but how ? i mean in a short bar magnet , the magnetic field leaves the north pole and goes towards the south pole Of the MAGNET itself , but in the case of the solenoid or a coil , it just looks as if the magnetic field...

Homework Statement So, I understand that I'm supposed to write the problem however, given the nature of current diagrams I think this is a bit hard. I am given the voltages and resistances and I have to solve for the current through each resistor. Here is a link to the problem which I found...

Suppose I take a random walk on a 2 dimensional square lattice, but this lattice plane has a finite size, e.g. Dx*Dy. I can not cross the boundary, my step length is the lattice cell size, I either go straight or make turns with right angle. Is there any work on this type of random walk? If...

I was playing with an old crt TV and a small loop antenna earlier and noticed that when I hold the antenna vertically in front of the TV I get one solid spike at around 15 kHz. When I hold the antenna horizontally I get a multitude of spikes that are not there when I turn off the TV. This...

Homework Statement Compute the current through R2 of the circuit in the figure. Homework Equations kirchoff's loop rule V=IRThe Attempt at a Solution Junction: I1+I2=I3 Alpha loop: V1-I3R3-I5R5=0 I1=(V1-I5R5)/R3=? Beta loop: V2-I8R8-I5R5=0 *without one of the currents provided I am not...

Homework Statement The following pseudocode demonstrates an algorithm to create a 2D array from a 1D array by adding elements into certain rows: For i = 1, 2, ..., n For j = i + 1, i + 2, ..., n Add up array entries A[i] through A[j] Store the result in B[i, j] Endfor...

Hi, I have a program that is entering a infinite loop in the last if else of this loop. The program is printing 3 endless times. Here is the code that generates it: else { for (j=1;j<n;j++) { if (j<=(n/2)) { a[1][j] = j-1; printf ("%d", a[1][j]); }...

When you start going around a loop to try and determine whether to add or subtract each voltage in that loop, how do you decide which? For example see the diagram just above Q7. http://www.facstaff.bucknell.edu/mastascu/eLessonsHTML/Basic/Basic5Kv.html Starting from any point and going...

Homework Statement A conductor (wire) is folded into a square loop with each side having a length of a. Total charge of Q is transferred onto the conductor. Describe the line charge density of the square loop in equilibrium. (If I am interpreting this correctly what is required is...

This is a problem I encountered while studying/practicing for my upcoming MCAT exam: Homework Statement A 1kg block slides down a ramp and then around a circular loop of radius 10m. Assume that all surfaces are frictionless. 1)What is the minimum height of the ramp required so that...

Homework Statement Consider AdS_5 space in Poincaré coordinates with metric ds^2=\frac{dz^2+dx_\mu dx^\mu}{z^2}. There is a circular Wilson Loop with Radius R in the Minkowskian boundary of AdS_5. We want to find the surface of minimal area in AdS_5 that has this loop as boundary. We choose...

Homework Statement A square loop of wire is made up of 50 turns of wire, 45 cm on each side. The loop is immersed in a 1.4T magnetic field perpendicular to the plane of the loop. The loop of wire has little resistance but it is connected to two resistors in parallel as shown. (a) When the loop...

I was looking at an example where it was evaluating a closed loop integral of a vector field around a triangle (0,0) (1,1) (2,0) by using greens theorem. This example was in the green's theorem section of the book so green's theorem must be used. Anyways the double integral was set up as follows...

Homework Statement Car Dynamics f(t)→ \frac{\frac{1}{M}}{s+\frac{D}{M}}→y(t) Applied Force Velocity Homework Equations M=1,000 kg and D=1000 kg/s Where f(t) represents the input force and y(t) is the output velocity. M is the Mass and D...

Homework Statement A tennis ball is a hollow sphere with a thin wall. It is set rolling without slipping at 4.08 m/s on a horizontal section of a track as shown in the figure below. It rolls around the inside of a vertical circular loop of radius r = 45.8 cm. given radius =0.458m ω= 4.08...

This is part of the derivation of vector magnetic potential of a small current loop center at origin and on xy plane. The current is stated to assumed to be constant along the loop. Attach is the scanned copy of the page in question. http://i43.tinypic.com/5f2q7d.jpgI cannot understand why the...

The vector magnetic potential is given \vec A=\frac{\mu I}{4\pi}\oint\frac{e^{-j\beta R_1}}{R_1}dl' After a few steps, the equation becomes: \vec A=\frac{\mu I}{4\pi}e^{-j \beta R}\left[ (1+j\betaR)\oint\frac{dl'}{R_1}-j\beta\oint dl'\right] The Book claim the second integral obviously...

Homework Statement Homework Equations The Attempt at a Solution The force on the loop due to magnetic field in the direction normal to the incline is ##qvB##. Balancing forces in the direction normal to the incline, mg\cos\alpha=qvB+N where ##N## is the normal reaction due to incline and v is...

Homework Statement r=0.10 m B=0.65 T Homework Equations ampere's law? The Attempt at a Solution

Hi there, Would anyone help me in simulating hysteresis loop in MATLAB? Thank You!

Homework Statement A square loop of wire of side length L lies in the xy-plane, with its center at the origin and its sides parallel to the x- and y- axes. It carries a current i, in a counterclockwise direction, as viewed looking down the z-axis from the positive direction. The loop is in...

How specifically does LQG explain how the universe can oscillate from big bang to big crunch ad infinitum? Wouldn't the total energy able to be used as work decrease after a couple of bounces? Am I simply misunderstanding or making a false assumption about what LQG's premises are? I've not...

In my circuit analysis textbook, there is an example problem using a KVL loop. Though it seems relatively simple, I cannot understand the answer. the loop consists of 3 voltages: -8, 12, and the unknown, Vr2. The polarities (clockwise) around the loop are respectively +,-,+. The answer...

Homework Statement A small loop with area 6.8 mm^2 is placed in a long solenoid with 854 turns/cm and a sinusoidally varying current w/ amplitude 1.28 A and angular frequency of 212 rad/s. What is the amplitude of the emf induced in the loop? Homework Equations \textbf{B}=\mu_0 in \Phi_B...

Hello, I'm working on a small scale parabolic trough concentrator project to generate electricity. This electricity is used for pumping water for irrigation,and I want to use an open loop Rankine cycle with no condenser(if it is applicable),to reduce cost,with the steam exhausting directly...

I have posted a question on here before regarding the generation of a number sequence. I followed up that question with an answer. However, as I have developed my code more I need to use an equation instead of a lookup table. Note: I'm using MATLAB Given a matrix A of size r x c where r >=...

Here's a picture: Edit: Here's a description of the problem in case the picture isn't clear. A 54-kg pilot flies a jet trainer in a half vertical loop of 1200-m radius so that the speed of the trainer decreases at a constant rate. Knowing that the pilot’s apparent weights at Points A and C...

Say I have an airplane that is performing a loop at a constant speed. Why is it that at the top of the loop the normal force points inward and not upward due to the lift of the plane? That way, at the top of the loop, when the pilot is upside down, he feels lighter due to the lift of the...

Homework Statement Consider a bead of mass m on a loop of radius R. The loop is rotating at a constant rate ω. Using a non-inertial frames of reference, find all equilibrium points of the bead on the loop. Homework Equations \vec{F_e}=m\vec{a_r}...

Some time ago I was doing my dissertation on inflation and wrote to Martin Bojowald to ask if loop quantum cosmology was compatible with eternal inflation or not. He said at the time that no work had been done on the subject but it might be something to look at in the future. I have now found...

Can someone explain why the running time of following piece of pseudo code is O(n) and not O(n2)? for i := 0 to n - 1 while A[A[i]] != A[i] swap(A[i], A[A[i]]) end while end for The for loop executes at most n times and the inner while loop executes at most n-1 times...

Could I treat this picture as a closed loop? This is part of a much larger problem, so this is all I need to know. I think I can because the ends go off to infinity, but I'm not sure. http://i.imgur.com/RFCsrqH.jpg

Homework Statement The figure below shows two circular regions R1 and R2 with radii r1 = 20.0 cm and r2 = 32.9 cm. In R1 there is a uniform magnetic field of magnitude B1 = 52.4 mT directed into the page, and in R2 there is a uniform magnetic field of magnitude B2 = 75.6 mT directed out of...

Homework Statement Homework Equations The Attempt at a Solution Solution is given. I don't understand how +-∏/4 is found as a range for θ Also why is 0 <= r <= cos2θ r is always r which is defined as cos2θ

Homework Statement I have attached the two questions. the first has a diagram. 1. Find the MAX Induced EMF (in volts) in the loop by the changing current? 2. What is the magnitude of the EMF induced in the loop by the changing current at t=.8 (seconds) answer in Volts? Homework...

Kirchoff's Loop Rule--Direction of Current? I came across this question, and it really confused me-- how does the current decide which direction it goes? The pictures are attatched below. The first picture is of the original questions. It gives two scenarios, and asks you what the value...

Homework Statement Radius of loop: 20 m Mass of cart: 225 kg Gravity: 10 m/s/s (once I figure out how to do this I'll use 9.8 in the final project) Found so far: B) Velocity (top of loop) = 14.14 m/s C) GPE at the top of the loop = 90000 N C) KE top of loop = 22500 N D) KE (bot) =...

Hi all, Has anyone know how to calculate the loop function of Higgs decay to photons/ gluons by t quark , or a useful reference. Cheers, Safinaz

Homework Statement Refer to Figure attached. The current in the long straight wire is i = (4.5A/s2)t2-(10A/s)t Find the EMF in the square loop at t=3.0s.Homework Equations \xi = -\frac{d \Phi}{dt} And Biot-Savart law for straight wires of infinite length: B = \frac{\mu_0 i}{2 \pi R}The...

Homework Statement How many NOP instructions are run in the nested loop below? [FONT="Courier New"] OUTER DW 4000 ;outer loop count INNER DW 62000 ;inner loop count MOV DX,OUTER WAIT1: MOV CX,INNER WAIT2: NOP NOP NOP...

Homework Statement Show that for plane waves, the following result holds: \oint \textbf{S}\cdot d \ell = 0. Homework Equations -- The Attempt at a Solution \oint \textbf{S}\cdot d \ell = \frac{1}{\mu_{0}}\oint (\textbf{E} \times \textbf{B})\cdot d \ell Now do I just use...

Homework Statement A square loop of side 1.5m and Resistance 2Ω is pulled with a constant velocity v=0.3m/s through a smaller region with a constant magnetic field B (out of the page) of 4T. The figure shows the position at t=0. Calculate the magnetic flux of the coil at t=4s.. Here is a...

Homework Statement A square loop of side length L is moving in the x direction with velocity v. v=vx. B points along the z axis and is defined by B=αxez where α is a constant. Find EMF along the loop Hint: Find forces on charges in rod by virtue of motion of the rod.Homework Equations...

Homework Statement We have a square loop with side length 2a, at xy plane. Now we know ( I have calculated ) that the magnetic field at the center of the square loop to be H = \frac{2I}{\sqrt{2} \pi a} Now we want to know what is the magnetic field at point P, which is on the axis which...

Homework Statement Hey all, I am studying for the GRE and I need help with this question: A rectangular loop of wire with dimensions shown above (see attachment) is coplanar with a long wire carrying current I. The distance between the wire and the left side of the loop is r. The loop is...

hi all, I wrote programming code for fdtd 2d tfsf in fortran 90 as below: !simulation for tmz mode incident plane in 2d subroutine tfsf2d implicit none double precision :: f0,miu,eps,delta,S,c,lambda,E0,N0 double precision :: deltat integer...

From control systems: I am asked to find the value of K that gives the closed loop damping ratio of 1/sqrt2. The value for the complimentary sensitivity is T(S)=(2KS +4K)/(s^3 +162S^2 +(320+2K)S +4K) so how do I find the value for K? I tried putting it in the general equation, but it...

Hi Everyone, This is my first post so bare with me. Firstly, a bit of background about the problem. I am designing a near rear drive train for a formula student car which incorporates a chain tensioning device linking the differential to the rear of the chassis. Essentially I am wanting...