Loop Definition and 1000 Threads

Homework Statement A long straight wire carries a steady current. A square conducting loop is in the same plane as the wire. If we push the loop toward the wire, how is the direction of the current induced in the loop related to the direction of the current in the wire? Homework...

I know this is relatively easy but I'm just confused on the process... Find the area inside one loop of a four leafed rose $$r = cos(2\theta)$$. I know that the formula is $$A = \int ^{\beta}_{\alpha} \frac{1}{2} [f(\theta)]^2$$ right? I'm just not sure what to plug in or solve for.

Homework Statement Let d = 0.048m, L = 0.15m, r = 0.10m in the following diagram. Assume that the current I1 = 80.0A and I2 = 40.0A. Find the net force on the rectangle of wire and the direction it points, and state the direction of the emf if the current I1 is increasing in the direction of...

Consider a small, thin loop in the (x,y) plane centered in the origin and with radius a. We are interested in the vector potential \mathbf{A} generated by the loop at a point P(r, \theta, \phi), with 2 \pi a \ll r, so at a great distance (moreover, a \ll \lambda). We need two coordinates...

Coming in here with the following question, when I see what kind of stuff you normally tackle, is very embarrassing! But... I simply am too rusty for this stuff, it seems. This is NOT homework. This is something I need to do in a game I'm working on. I end up in and endless loop when trying...

What is it controlling and What devices are in the loop

Most of us are familiar with the fact that in Loop gravity the area and volume observables have discrete spectrum. The discrete spectrum of the area operator, leading to a smallest positive measurable area, has lots of mathematical consequences that have been derived in the theory. It helps...

Homework Statement What is the strength of the magnetic field at the center of the loop in the figure? See attachment Homework Equations B = Mu_0*I/(2*R) The Attempt at a Solution I plug in the information to this equation and get .00038 Tesla which is incorrect. Does the...

"Use Kirchhoff’s rules to calculate the current through each ideal battery in the figure below. R1=1Ω, R2=2Ω, ε1=2V, ε2=ε3=4V. You should apply Kirchoff’s loop rule to the ε1-R1-R2-ε2-R1 loop, and the ε2-R2-R1-ε3-R1 loops respectively, each time starting from the negative end of the battery...

Homework Statement Create a program that displays a vertical bar character ‘|’ moving left to right in 79 positions across the screen, then back right to left across the screen. Homework Equations (16 bit Assembler) The Attempt at a Solution .model small .stack 100h .data...

Hey guys, I was messing around with my guitar (classical guitar) and my amp lately. I put the treble on lowest, bass highest, reverb highest, mid highest and mid frequency lowest. When I pluck a string when my guitar is close to the amp, the amplified sound from my amp causes that string to...

Homework Statement A square loop of wire with a small resistance is moved with constant speed from a field free region into a region of uniform B field (B is constant in time) and then back into a field free region to the left. The self inductance of the loop is negligible In case my image...

From the Wikipedia article on the Riemann curvature tensor: The last sentence assumes that ##\tau_{sX}^{-1}\tau_{tY}^{-1}\tau_{sX}\tau_{tY}## returns Z back to x0. It isn't obvious to me that this should be true. My guess is that this is true because X and Y commute, but I can't think of a...

Hey guys, I'm new to fortran and I'm having a slight problem. I put my code below as reference. I first set up a my known values. Then I used an equation to solve for v. After I solve for v I then computed c which involves v. What I'm now trying to do is to loop the value I got for c back...

Homework Statement Find the current in each branch of the circuit of the figure below . Specify the direction of each. ___|+5V_____/\/\/\/\____ |____________/\/\/\/\____| |___|+1V_____/\/\/\/\____| The top resistance is 22, middle is 56, and the bottom is 75. I'm predicting...

Homework Statement Hello everybody I was hoping some of you could give me some some examples of some closed feedback loop mechanical systems. This is for my controls class where we have to design our own control system. I'm having trouble trying figure out some systems. I know one would...

Consider a conducting loop with resistance R and area A suspended by a non-conducting wire in a magnetic field \vec{B}=B\hat{y} . The wire is a torsion spring with constant k.The equilibrium state of the loop is when it resides in the yz plane and its suspension is somehow that it can rotate...

I am trying to solve for isc. The correct answer is isc = 6mA but I got 0 mA. My equations must be correct... If they are not please someone explain why. Thank you.

I have a variable number of vectors to concatenate in my Matlab model. Is there a way to do this without a for loop? The number will depend upon input parameters. Suggestions.

How to increment a MATLAB "for" loop by an arbitrary value? I am creating a Matlab program that calculates corresponding temperatures for Celsius, Kelvin, Fahrenheit, and Rankine scales. I want to write my code so that it can handle an arbitrary temperature increment (a user-inputted value)...

Homework Statement A uniform magnetic field B is perpendicular to the plane of a circular wire loop of radius R. The magnitude of the field varies with time according to B=B0exp(-t/τ) where B0 and τ are constants. The time dependence of the induced emf in the loop is a) exp(-t2/τ2) b)...

I'm trying to get a feel for the overall magnitude of the Earth's magnetic field. If I placed a superconducting belt around the Earth magnetic equator, how much current would that loop have to carry to approximate the Earth magnetic field? Currently, the field at the equator is about 31 microT...

1. Homework Statement [/b] Hey Guys Firstly thanks for looking, I really appreciate any help or interest with my problem. The problem is a closed loop feedback system it's unlike any I have come across before. I have been given the definition which is as follows:- G(t)^-1 = 2.5...

Homework Statement Generate an open loop u(t) and simulate. Plot x(t) and y(t) \dot{x} = Vcos(θ) \dot{y} = Vsin(θ) \dot{θ} = u I am given initial values. All are 0 except for \dot{x}(0) = V. Homework Equations Laplace Transform Tables The Attempt at a Solution I think I...

Hello, I am in need of big help here. I don't know what else should be done to get this correct. I have to build this PLL circuit and choose any 3 N (integer) of the N-divider. Then I have to observe the input signal Sig_in and the output signal VCO_out for each N. The result should be that the...

Homework Statement Find direction of force on circular loop http://pokit.org/get/img/b886e52efb703d47d09fa6e781c74461.jpg What would hapend if direction of the current in a straight conductor were different ?Homework Equations ------The Attempt at a Solution...

How to design a class, that executes an infinite loop, but may be paused, resumed and stopped by user input? I'll give you an example class Simulation { public: void start(){ m.init(); while(!m.isFinished()) m.update(); // computationally expensive calculation } void pause(); void...

Wide/Narrow Hysteresis loops, what's the difference? When calculating the work done to magnetize a ferromagnetic material, calculating the hysteresis loop is the right way? I know the narrower loop(soft) needs less energy(work) to magnetize or demagnetize it is that true? That's why it's...

If you search major book retailers on the internet, you can find lots of new and very good books on string theory, for both novice and more advanced students. However, for loop quantum gravity, you can't really find anything. Is there an introductory book that takes you from QFT to LQG ? Where...

Homework Statement A current of 5 A is passed through a single wire loop, producing a magnetic field of 3.4 x 10^-3 T at the center. What is the radius of the loop? Homework Equations B = μNi / 2r The Attempt at a Solution B = 3.4 x 10^-3 N = 1 i = 5 B = μNi / 2r 3.4 x...

Why is the magnetic flux density uniform at the center of the circular loop ?

Homework Statement A 0.27 kg toy car is held at rest against a 1796 N/m spring compressed a distance of 8cm. When released, the car travels a distance of 112cm along a flat surface before reaching a 0.30m high loop. The friction coefficient of the flat surface and the toy car is (0.4...

Suppose you want to find the magnetic field at a point p at the z axis from the picture attached. Attempt to understand this problem: The way the books solves it is that it says the angle theta between current element i ds and r is 90. Then he calculates the integeral which has two...

Homework Statement Suppose that the magnetic eld in some region has the form B = kzx(hat). (where k is a constant). Find the force on a square loop (side a), lying in the yz plane and centered at the origin, if it carries a current I, flowing counterclockwise, when you look down the x axis...

Homework Statement I am trying to create a code, in Matlab, that will describe the geometry of a PARSEC airfoil. The x coordinates for the upper and lower surfaces of the airfoil shape simply run from 0 to 1 (for a unit chord length). The z-coordinates (that describe the shape) are given by...

Homework Statement A small bead is on square loop in the xz plane with dimensions (±R, 0, ±R). An electric field is turned that is ##\vec{E}(\vec{r})=-Cx\hat{z}## Calculate W Homework Equations ##W= \int q\vec{E}\bullet dl## The Attempt at a Solution Starting with z direction...

So I have a constant force F acting tangentially on a mass m in a vertical circle around a loop of radius r. The mass starts from rest at the very top of the loop. The only other force is gravity, that is m*g Now I did Work=Change in energy with a system that is comprised of both the...

Homework Statement A wire loop of resistance R and area A has its normal along the direction of a uniform magnetic field, B. The loop is then flipped over in a time Δt so that its normal is opposite to the field. a) Calculate the average induced EMF. b) Find the average induced current. c) If...

Homework Statement A conducting loop with area 0.13m2 and resistance 6.0Ω lies in the x-y plane. A spatially uniform magnetic field points in the z direction. The field varies with time according to Bz=at2−b, where a = 2.8T/s2 and b = 8.0T . (a) Find the (magnitude of the) loop current...

Dear All: For a line structure(say a very long atomic chain) and a closed loop structure( connect the head and tail of this atomic chain). Does there exists a transformation between these two structures? For example if we want to study the vibration mode of these two cases. If we already know...

Does there exist a transformation between a line and a closed loop ? Dear All: For a line structure(say a very long atomic chain) and a closed loop structure( connect the head and tail of this atomic chain). Does there exists a transformation between these two structures? For example if we...

Karami's talk is scheduled for Tuesday 29 October in just a few days. http://relativity.phys.lsu.edu/ilqgs/ The title has not yet been posted. It is a good bet that it will be about one or more of the active topics in Loop cosmology of which there are quite a few. Karami's recent work...

The fourth quarter 2013 has already seen an interesting bunch of Loop gravity research papers. I'll list a few and say why I think they are remarkable. Some make meaningful progress along established lines, while one or more others take an unexpected direction and are clearly exceptional...

What is the difference between a short bar magnet and a long bar magnet ? How is the magnetic field passing through circular loop similar to short bar magnet? And if a number of circular loops are connected to diff sources of current but attached together , do they form a solenoid ? Or are the...

Can anyone help me to in this problem? I want to use DO loop in Plot order at mathematica 8, how can I do this? I want to change one variables and see the changes in other variables in the graph, and want to plot all of my graph in one Plot order. Like this. I Uploaded my file too.

Homework Statement In Fig. 8-28, a small block of mass m = 3.0 kg can slide along the frictionless loop-the-loop. The loop has radius R = 0.80 m. The block is released from rest at point P, at height h = 2.9R above the bottom of the loop. I attatched a picture (a) Find the speed of the...

I can't go into detail right know - but the thing is: in order to make a real antimatter engine one would need to make a loop of SCs wire r = 70 m, where r(wire) is approx. 20 cm. I need to generate about 10 T in the center of the field, that is 70 m from the nearest wire. How much mechanical...

Homework Statement http://ezto.mhecloud.mcgraw-hill.com/13252699450881445581.tp4?REQUEST=SHOWmedia&media=ch28q44a.jpg A long, straight wire has a 11.1‐A current flowing in the positive x -direction, as shown in the figure. Close to the wire is a square loop of copper wire that carries a...

I remember having studied that closed loop systems can be represented by open loop systems. But that seems weird..if it were possible for both the types of systems to have the same transfer function, why would they behave differently?

Homework Statement A circular conducting coil is present in space in the absence of any external electric and magnetic fields.A steady and constant current is flowing through the coil.What is the tension developed in the coil?.(Given current is 'I' and radius of coil is 'r') Homework...