Lines Definition and 1000 Threads

Hello All, I was just checking magnetic field lines as in attached figure. I am curious to see some gaps between adjecent field lines in the figure. Why it is not like a sheath( for example in lighting field) but as lines? Thanx in advance Abraham

Homework Statement (a) Find the capacitance per unit length and find the inductance per unit length of a transmission wire above a infinite conducting plane. I used the image method (b) Show that EM waves can propagate, and find their speed and the characteristic impedance of the line...

I have read in my schoolbook that when a wire of length l moves at velocity v in a magnetic field cutting the flux lines an emf is induced which it is calculated from emf = blv, I understand that emf is induced at time variation of magnetic flux across the wire, but I Can't see any change in the...

"The figure below is a lines of force representation of an electric field." "In the figure above is the electric field stronger at point X or point Y What evidence in the diagram indicates that this is the case?" My answer: Y. Because the lines of force are closer together. In what direction...

Homework Statement A spectroscopic instrument can resolve two nearby wavelengths λ and λ+Δλ if λ/Δλ is smaller than 8000. This is used to study the spectral lines of the Balmer series of hydrogen. Approximately how many lines will be resolved by the instrument. The Attempt at a Solution...

I think everyone has heard about equipotential lines and equipotential surfaces; such as lines of force too. My question is: exist surface of force too? If yes, what is it?

I draw Feynman diagrams in JaxoDraw. But If I draw gluon line up to down or down to up, I get different results for gluon lines. I share a picture to explain my problem. Are these two diagrams the same? http://img809.imageshack.us/img809/3184/rq9z.jpg

Hi All, I'm really curious to know how we can predict the shapes of constant property lines (isenthalpic/constant internal energy/isotherms/isentropes/isobars) on any given plot, such as T-s and P-v or even u-s diagrams. Is there a rule to do so? Usually in practice we deal with p-v and T-s...

Hello, I have a rather conceptual question I couldn't really find an answer to yet. The electric field lines of an isolated resting electron would simply point from everywhere in space towards the position the electron is located in, with a length inversely proportional to the squared distance...

My problem: I don't know how to begin with this problem.

Hello all I am hoping someone could help shed some light on a surveying problem I am having. The problem is this:- • A circle is centered at point B with Known co-ordinates (X2,Y2) • The circle has a radius which is known (R). • Point A lays outside of the circle with known...

Hi. I studied calculus a while back but am far from a math god. I have been reading around online about hyperbolic geometry in my spare time and had a simple question about the topic. If a straight line in Euclidean geometry is a hyperbola in the hyperbolic plane (do I have that right?)...

The two charges are (-q) and q. I'm just curious as to how you go about graphing them. Thanks!

Here is the question: I have posted a link there to this thread so the OP can see my work.

Homework Statement "A gas discharge tube contains H 1 , H2, He 3 , He4, Li6, and Li7 ions and atoms (the superscript is the atomic mass), with the last four ionized so as to have only one electron. (a) As the potential across the tube is raised from zero, which spectral line should appear...

Equation of plane containing points (a,0,0) (0,b,0) (0,0,c) Vectors <-a,b,0> <-a,0,c> Normal vector <bc,ac,ab> Plane Bc(x-a)+ac(y-b)+ab(z-c)= Bcx+acy+Abz=3abc Book is showing = abc

I've noticed that electromagnetic field lines are very similar to stereographic projection of 3D sphere on 2D surface. Pictures below. In such comparison, electric field represents longitude and magnetic field represents latitude. For more visualization see...

Homework Statement A small power plant produces a voltage of 6.0 kV and 150 A. The voltage is stepped up to 240 kV by the transformer before it is transmitted to a substation. The resistance of the transmission line between the power plants and the substation is 75 Ohms. What percentage...

write the equation of the plane x - 2y - 2z = 27 in the form r.\hat{n} = d done write down the distance of the origin from the plane and show that the point which is the reflection of the origin is (6, -12, -12) done A second point P has coordinates (-3,2,1). Find the direction cosines of...

Hi, I hope I'm asking this in the right place. I need to understand this in order to complete a project, but it's not exactly a 'homework question'. I have some data which has a linear trend. The x values all have the same (random) uncertainty of ≈5cm and the y values all have the same random...

Homework Statement If all the lines given by the equation (3\sin \theta + 5\cos \theta )x+(7\sin \theta - 3\cos \theta )y+11(\sin \theta - \cos \theta)=0 pass through a fixed point (a,b) forall theta in R then |a-b|= Homework Equations The Attempt at a Solution Dividing both sides by...

At the power-line frequency (50Hz), the wavelength of electromagnetic waves in free space is 6,000 km. Similarly, the phase velocity of voltage/current waves is about 4,000 km at this frequency. The question is, why do we bother about the wavelength at all at the power-line frequency, when the...

Is there only one point where the line connecting the two skew lines is perpendicular to them both? And is that point always always always the place of closest approach? Thank You

Hello all, I have two blocks, and I want to draw multiple parallel lines between them. This is the Latex code I have \documentclass{article} \usepackage{tikz} \usetikzlibrary{shapes,arrows,fadings, shadows} \usepackage{amsmath,bm,times} \begin{document} \pagestyle{empty}...

Hi y'all I am trying to compare two files, so make one line from one file be compared to alll the lines in the other file until it finds a match where the difference is less than 0.003. This what I had thought of, but I still think it is just comparing line by line, instead of one line to...

Homework Statement Let line L1 be the line through origin O and the point B(2,-1,-2). Let line L2 be the line through point A(3,1,-1) with direction vector i-j-k. Obtain a vector n, orthogonal to both lines. Use n and the vector OA connecting the lines to find the shortest distance between...

the calcs are mine, the only way I could see to solve this was to convert these to the $y=mx+b$ line eq and solve simultaneously to the intersection of $(x,y)$ not sure how you take them as they are given and find point P the intersection just as vectors. also, I tried to input a vector...

I have a question about the equation of a line Are the forms <x0+at,y0+by,z0+tz> And t=(x-x0)/a=(y-y0)/b=(z-z0)/c only for straight lines?

how transmission carry both power frequency(50Hz) and communication frequency (MHz) at a time

This lady who takes our class, she set this question in one of our papers: 'The wavelengths of the dark lines are exactly the same as those of bright lines in the absorption spectrum.' - True or false? I answered true. Have I been wrong?

I guess this is maybe more of a vector calculus question, but here it goes. Say I have an arbitrary current distribution \vec{J} with the corresponding magnetic field given by \vec{\nabla}\times\vec{H} = \vec{J} \vec{\nabla}\cdot\vec{H} = 0 What is the best way to calculate the field/flow...

Hi, I've seen pictures like this one: http://www.lcst-cn.org/Solid%20State%20Physics/Ch25.files/image002.gif Is there any good explanation somewhere on this subject? I'm using Kittel's book but there's nothing in there on this.

Homework Statement Expanded from Griffith's (3rd ed) #2.47 Infinitely long wires parallel to x-axis carrying ±λ charge densities intersect the y-axis at ±a. A) Calculate V(x,y,z) if V(0,0,0)=0 B)Show that the equipotential surfaces are circular cylinders. Locate the axis and calculate...

So I've been wondering.. from my previous post: https://www.physicsforums.com/showthread.php?p=4500082#post4500082 if we have a plane of infinite charge, then electric field does not depend on distance however, for a infinite line of charge: If we use a cylinder with radius 'r' as our...

So if you have one positive charge and one negative charge (both with the same arbitrary number of field lines) close to each other, could you theoretically move a 2nd positive charge as close as desired to the first positive charge without them repelling? Or am i misunderstanding the concept of...

Suppose I have a parameterized line ##\phi:\mathbb{R}\to\mathbb{R}^n## given by ##\phi(t) = (x^\mu(t))|_{\mu=1}^n##. How can I tell that the line is straight. My best answer so far is that at every time ##t## the acceleration (2nd derivative) is parallel to the velocity (1st derivative), i.e...

Homework Statement Find the equation of the tangent, and the line which passes through the origin to the point where x= 3/2 4x2+9y2 = 36Homework Equations The Attempt at a Solution Using implicit differentiation d/dy [4x2+9y2] =36 8x+18y dy/dx = 0 dy/dx = -8x/18y Coordinates are (1.5...

I understand how position vs. time diagrams can give velocity. If the line is flat then the velocity is zero (the particle is still), and all the other basic things I need to know, but what if the line was vertical? The slope would be undefined; therefore, velocity would be undefined. In...

Homework Statement Show that if the two lines ##\frac{x - c_1}{d_1} = \frac{y - c_2}{d_2} = \frac{z - c_3}{d_3}## and ##\frac{x - d_1}{c_1} = \frac{x - d_2}{c_2} = \frac{x - d_3}{c_3}## intersect, they lie in the plane ##r.(c \times d) = 0## where c = c1i + c2j + c3k and d = d1i +...

I started by getting the equation for the reaction(which is really simple). I'm a bit confused here, they're asking for the absolute maximum moment, but they're not locating the location of where the maximum moment will occur, should I assume it's happening on the middle of the beam? And another...

I started by getting the equation for the reaction(which is really simple). I'm a bit confused here, they're asking for the absolute maximum moment, but they're not locating the location of where the maximum moment will occur, should I assume it's happening on the middle of the beam? And another...

Here is the question: I have posted a link there to this topic so the OP can see my work.

hello In MTW excercise 22.6, given a fluid 4-velocity u, why the expression : ∇.u is called an expansion of the fluid world lines ? Is the following reasoning correct ? We know that the commutator : ∇BA - ∇AB is (see MTW box 9.2) is the failure of the quadrilateral formed by the vectors...

Basically I don't know anyone in real life that can help me with this, so I need help checking to see if my answers are correct :) PART A 3) Solve 2x^2 + 4x = 15 by using the quadratic formula. x = -1 +/- 2sqr34 4) Determine whether the given pairs of lines are parallel, perpendicular, or...

Hi, i got problem i am trying to solve. Basicly i got point moving along bunch of lines ( either rectangles/triangles it is custom, generated in code ). I am using this equation to find out x,y coordinates for moving along specific line : (its taken from code ) x = x1 + center.x + (x2 - x1)...

Warning: Rant ahead I get more and more drawings from vendors where all lines seem to be of the same thickness. Makes it awfully hard to tell if a line's a dimension line, a leader, a projection or a real part outline. Do others share my annoyance? Is this an evil of the post-AutoCAD era...

I'm having some difficulty with this problem and any help would be appreciated. What is the radius of a circle tangent to the lines y = 3x + 7 and y = .5x - 3 and containing the point (8,1)? I've determined that the given point (8,1) is the point of tangency of the line y = .5x - 3 and the...

Homework Statement What would the electric field lines / equipotential lines look like between point charges that are set up with potentials of 20 volts and 30 volts versus point charges that are set up with potentials of 0 volts and 10 volts? The Attempt at a Solution At first I thought the...

Here are the questions: I have posted a link there to this topic so the OP can see my work.

Homework Statement Find the equation that contains the lines: 2x + 3y + 4z = 6, x - 2y + z = 3 and (2x - 1)/22 = (y + 2)/2 = (1 - z)/3 Homework Equations A plane (in point normal form) is defined by a point on the plane and a vector normal to it. In general, the form of A(x -...