Loop Definition and 1000 Threads

Homework Statement I eventually have to solve for maximum angular acceleration of the loop in a magnetic field, and I have gotten everything with the exception of the moment of inertia, so I won't include the emf and B known variables. Known: a copper wire with a density of \rho = 8960...

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. (Use any variable or symbol stated above along with the following as necessary: μ0.) Homework Equations...

Hi all, Im having a problem with the for loop. Any help would be great! The code is simple, x = -3:0.5:3; For i = x q(i) = i^2; end q The error seems to be the negative index in the statement of the for loop. Hope this is clear. Thanks!

Homework Statement A conductor in the shape of a square of edge length 0.28 m carries a current I = 17.0A. Calculate the magnitude of the magnetic field at the center of the square. Round your answer to three significant figures. Take the permeability of free space to be 4*pi*10^-7...

I am trying to understand Type1, 2 and 3 opamp compensators used in DCDC converters. Type 1 is just an opamp integrator. Type 2 has a C in feedback loop with parallel RC. How does this boost the phase Margin? (page 307 - http://tinyurl.com/3qyt5dc) I understand phase and gain margin when...

Hey i need help in ODE45...i'm new to PF...pls help me i have the following code >>for i=1:5 >>tspan=[0 30] >>h0=Hv(i) >>[t,h]=ode45['a ODEfunction',tspan,h0] >>plot(t,h) >>end in this loop how can i save 5 values of [t,h], as t, h produces each loop run like follows t= 1 2 3...

im on the topic of electricity and magnetism, and came across walter lewin's lecture. i cannot visualise how the 'open surface' of this solenoid will look like is the open surface a riemann surface? or something else...

Homework Statement In the figure below, a circular loop of wire 12 cm in diameter (seen edge on) is placed with its normal at an angle θ = 30° with the direction of a uniform magnetic field B of magnitude 0.60 T. The loop is then rotated so that N rotates in a cone about the field direction...

Homework Statement Use the primes function to create a list of all the primes below 100. Now use a for loop to multiply adjacent values together. For example the first 4 primes numbers are 2 3 5 7 your calculation would be 2*3 3*5 5*7 which gives 6 15 35 Homework...

Homework Statement In the figure below, a rectangular loop carrying current lies in the plane of a uniform magnetic field of magnitude 0.038 T. The loop consists of a single turn of flexible conducting wire that is wrapped around a flexible mount such that the dimensions of the rectangle can...

Fig.35 shows a light and flexible conducting loop X freely hung on a smooth horizontal rail. A bar magnet PQ approaches the loop from the right. Which one of the following descriptions about this process is correct? A If P is a N-pole, the loop will be repelled to the left and its area...

I contend this cannot be done! A popular method of modeling non-linear cores is to obtain the values for remnant flux density, saturation flux density, and the coercive force at some major hysteresis curve, and to then mathematically extrapolate a curve (a few other parameters are also needed...

i want to loop on K vector values K = [3 5 7 9 11] and have with me inside the loop the index of the current vector value if i made for K = [3 5 7 9 11] disp(K) end i'll not have the index of K values i mean when K=9 i want to know that I'm in index 4 how to make that??

Homework Statement Use double integrals to find the Area of one loop of the rose r=cos(3theta) I know how to solve this, the only question I have is why theta is between -pi/6 and pi/6. I don't understand where those two values come from.

I'm a novice in Loop Quantum Gravity, so please bear with me if this is a trivial question. As far as I know, LQG is usually formulated non-perturbatively, but is there also a perturbative approach in the sense that we use a series expansion in order to calculate vacuum expectation values? Are...

Hi everybody, I have just joined this forum and I have a problem in fortran programming. I want to do a program in fortran where in the do loop it will read an input file from the first line upto a line and again it will go to the starting line of the file in the next loop and read...

Homework Statement "You push a rectangular loop of width .2m, length .8 m, and resistance R=200\Omega into a magnetic field (out of page) Bout=.4 T and a speed v=.2 m/s. The long side of the rectangle is parallel to the x axis. What is the current flowing in the loop?" Homework Equations I...

Hi. I have a question concerning the magnetic momentum of a current loop. We know that if we have a circular current loop (a solenoid with N=1), there is a magnetic moment (mu) in the center of the loop given by "mu=S I" (I=current, S =surface enclosed by the loop). So, if there is an external...

OK... My question is, if I have so system like square loop... and all the donations be summed up by Bcos(Tetha) or sin(Tetha), am I need to multiply the cos/sin in Biot -Savart rule? So I will get dB=const*dx * sinTetha*cosTetha / r^2 or I just need to exchange cos with sin? (if all...

at the beginning of college some years ago, i took a part time job working in produce. i worked there through a BA and an MA in mathematics, and now i looks like I'm ready to approach a PhD in applied mathematics, but I'm still working there. i cannot simply quit because i need the health...

Homework Statement The radius is 7ft, the diameter is 14ft, the person is 181lb and is 6ft 1in. How fast does he have to start the loop to be successful all the way around? How high does he have to start? Don't need to apply Friction. Homework Equations Cetripetal Force? Flo...

Homework Statement Reading my text I see the definition of open loop transfer function as GH and closed loop as G/1+GH I cannot understand the def. of open loop t/r func. Shouldn't it be just G? (B/w with open loop I understand that there is no feedback...) Homework Equations The...

Homework Statement I'm trying to determine this insane circuit's |Z| so I can use an AC voltage to find the current as a function of time. This is my circuit (the switch is closed, and ignore the values): http://i.imgur.com/mA55I.png Homework Equations Impedances for each of the RLC...

I don't quite understand the properties of loop quantum gravity. I have searched around and have not come up with anything very helpful. I'm pretty good when it comes to understanding quantum mechanics and string theory, but please, NO MATH! I'm only in high school! thanks

Homework Statement I tried using \ooiint, I want a loop that circles both integrals (two), anyone know?

Homework Statement Find currents in every loop of the circuit, find voltage on every element,build vector schelude for currents in the circuit. Homework Equations The Attempt at a Solution R1=35 Ohm R2=40 Ohm R5=30 Ohm R6=20 Ohm L4=25millihenry C4=40microfarad...

Homework Statement At the top of the loop, we are in an upside down position, with our head being pointed towards the centre of the circle. As long as the ride is fast enough, it's impossible for us to fall out. But what happens if the ride slows down? if the rollercoaster slows down, the...

Homework Statement A current carrying loop of wire is being monitored using a Hall-effect magnetic field probe placed at its centre. The loop is in air and has a radius of 0.5 m. It is required to monitor the magnetic flux in order to trip the circuit breaker if the current exceeds 100 A...

hi. I am trying to assign matrices to variables using for loop in MATLAB. can anyone help me wid dis? Thnx.

Homework Statement A rectangular conducting loop of dimensions l×w and resistance R rests in the plane of a long straight wire as shown. The closest edge of the loop is a distance a from the wire. The current in the wire is in the upward direction and increases at a constant rate from I to...

TI-89 "PAY" program, infinite loop problem? I have tried to write a program required for class (Math Analysis, junior in high school, everyone else has an 83 or 82 but my grandmother bought me this one...so nobody else has been able to help yet) but after solving one error message (I had to...

Hi, I'm new to this forum and only have a few months experience with MATLAB but am getting to know it. Hope you can help me. I have a for loop which looks like: for f = a:a:b command end Now, I only want to execute this command for the integer values in this loop. eg. if it was...

Homework Statement A Loop of height L and initial width X is placed in a magnetic field and the plane of the loop is perpendicular to the field, the loop is connected to a light bulb of resistance R. By applying a force F to the left hand side of the loop it can be compressed at a constant rate...

I'm wrestling with the notion that a small coil of wire in a planar flat spiral can be a real tuned antenna. The fact that the coil is only three turns and about the diameter of a quarter further irritates my ability to understand how such a simple thing can be viewed as a real antenna. The...

Homework Statement Here is the problem and the picture that goes along with it. I am really stuck because our teacher never explained a problem like this to us before. Any help is appreciated! THank you so much...

Homework Statement In the problem there's a circuit pictured with 3 resistors and three ideal batteries (emf = V). I need to calculate the current through all the resistors (I1,I2,I3). Homework Equations I1 - I2 + I3 = 0 V=RIThe Attempt at a Solution left loop is 92V - 140*I1 - 210*I2 + 55 = 0...

Homework Statement A force acts on a rectangular loop of wire, pulling it out of a magnetic field. Calculate the force required to pull the loop to the right at a constant speed of 4.42 m/s. B = 0.44 T l = 0.350 m v = 4.42 m/s R = 0.356 ohms Homework Equations Fmagnetic=I*l*B...

See what you think of this: http://arxiv.org/abs/1105.0216 Regge gravity from spinfoams Elena Magliaro, Claudio Perini 8 pages (Submitted on 1 May 2011) We consider spinfoam quantum gravity in the double scaling limit \gamma\rightarrow 0, j\rightarrow\infty with \gamma j constant...

Hi all, What is the potential generated by a electric loop? I have found two ways to sovle the problem. One is since the charge density does not change with time, we can write it as \phi(\vec{r_{0}})=\oint\frac{\rho_{static}}{|\vec{r}-\vec{r_{0}}|}d\vec{l}. But what is \rho in this loop? Is...

Homework Statement There are four uniformly charged rods of linear charge density \lambda and length a, arranged as a square. What is the electric potential a distance z from the center of the square and along the symmetrical axis? The Attempt at a Solution...

Greetings, I have a problem that's been bugging me for a few days now. I've asked electrical engineers, students and graduates, and I can't seem to find a clear-cut answer to these questions. THE SCENARIO One piece of copper wire has one end connceted to a terminal from a multimeter...

Hi, I was reading through Jackson's Electrodynamics trying to reason through example 5.5 for the vector potential of a circular current loop of radius a centered at the origin. I pretty much understand everything except when he defines the current density as J_{\phi} = I\sin \theta'...

Homework Statement I understand that if we have a solenoid with AC current running through it, it will create a changing magnetic flux. Suppose now we place the solenoid in the centre of the a single loop wire, according to faraday's law of induction, that single loop wire will have a...

Homework Statement a closed wire loop with current I is in a uniform magnetic field B show that the total magnetic force on the loop is zero Homework Equations The Attempt at a Solution everywhere that I've looked just states it without explaining why

The maximum torue experienced by a circular, one-turn, coil in a 0.75T magnetic field is 8.4x10-4Nm. If the coil current is 3.7A, find the coil wire length. Homework Equations τ=Fr F=ILBsinθ ? r=L The Attempt at a Solution (8.4x10-4Nm)=[(3.7A)L(0.75T)sin90]L L=0.017m Can I do...

Hello everyone, curious about something here. I saw a demonstration lately were a magnet was dropped down a copper pipe and the magnet dropped very much slower than expected. What I got to thinking was, if you replaced the copper pipe with the same quantity of insulated copper wire in a...

I know that current can flow in loop only. I mean circuit must be complete for current to flow. So my question is: If someone is hanging in the air holding power transmission line, he doesn't get shock. Because circuit is incomplete. But if he touches ground in same position then he receives...

Homework Statement A long, straight wire carries a current of 14A. Next to the wire is a square loop with sides 1.0m in length, as shown in the figure. The loop carries a current of 2.5A in the direction indicated. http://img69.imageshack.us/i/walker2260.jpg/ Calculate the magnitude of...

Homework Statement A compass is placed in the middle of a metal loop with radius 0.10m. The compass points in the direction of the Earth magnetic field when the loop is at rest. When the loop revolves around an axis perpendicular to the Earth's surface with constant angular velocity, the...

So I need to study Lenz's law and have only learned the absolute basics so far. I'm a little stuck on this study question. I'd really appreciate anyone who helps solidify my understanding of it a little bit! Homework Statement Consider a circular loop of wire near a long...