Lines Definition and 1000 Threads

Hi. I'm a student in AP Physics this year and we started the E&M portion this week and we learned about electric fields. I was watching MIT's OpenCourseWare in order to get more comfortable with the concepts. The lecturer said that charges do not follow electric field lines because of the...

So I'm doing some programming, and to simplify a very large amount of if statements, I've decided to put it down to a few lines with a simple equation, I've done this before with other things, but it was very much trial and error. Therefore I'd like to see how it can be done in a more...

While there is a lot of information on the internet concerning charged particles in a magnetic field, there is very little on the motion of an uncharged ferromagnetic object in the magnetic field of a permanent magnet. I only found one animation of an uncharged object in the magnetic field of...

well, if we lay power lines along rails and use the magnetic field to lift trains, would it increase the transmission loss?

This is a question I am stuck on and id really like some help pleasezzz ! Two straight lines are given by the equations: R= 17i -9j+9k +a (3i+j+5k) R=15i - 8j - k + b (4i + 3j ) where a and b are scalar parameters.Show that these lines intersect and find the postion vector of their...

Could anyone help solve a problem how to find absorption lines in hydrogen atom from n=10 (n - principal quantum number). I know that not all quantum jumps of an electron in atom are possible, thus I don't know how many different emission lins will be from this energy level where n=10.

Homework Statement What is the shortest distance between these two lines? L1:(x,y,z)=(4,−2,−2)+t(1,1,−3) L2: The line through the points (−2,−2,0) and (−4,−5,0)Homework Equations distance formulaThe Attempt at a Solution I thought I was on the right track but apparently not. For L1, I took 2...

Homework Statement A planetary nebula is larger when imaged in H\alpha than when observed in a Helium line, Why? Homework Equations The Attempt at a Solution I understand that a planetary Nebula gives an emission spectrum and that If the nebula looks larger in a H line there is...

I've long understood that voltage is stepped-up in power t-lines to decrease losses, however, I've never really understood the math reasoning behind it. Isn't P = V^2/R the same as P = I^2*R? If so, it seems that either increasing V or increasing I would invoke the same losses... Could...

Homework Statement The spectral lines of the light from distant galaxies exhibit a Doppler redshift due to the motion of the galaxy away from our own. For a particular galaxy, three spectral absorption lines are observed from the Earth to have wavelengths of 164.4 nm 168.4 nm and 177.5 nm...

I had set up an inductive and capacitative ladder network to model a coaxial cable( or low pass filter)- 20 sections of L= 0.1 H and C=0.11 microF That works out as a characteristic impedance of 953ohms. The circuit starts at a signal generator, then 5ohms resistor before the low pass...

Homework Statement Find an equation for the plane containing the lines: x-3= 4t , y-4 = t, z-1 = 0 x+1 = 12t, y-7 = 6t, z-5 = 3t The Attempt at a Solution I found the equations of both lines. First line: (3, 4, 1) + t(4, 1, 0) (-1, 7, 5) + t(12, 6, 3) Now I take the cross...

Homework Statement Find a and b such that the point (a,b,0) lies on the line passing through (-1,-1,6) and (-9,7,2) Homework Equations Basic line equations, from P to Q= Q-P..etc The Attempt at a Solution I keep getting the wrong answer, but I got a point at exactly P (-1,-1,6)...

Does the strength of a magnetic field become weaker at a constant rate the further you get away from it? I ask this question for two reasons. 1 - When iron filings are placed on a piece of paper and and a magnet is placed under it, there are definite lines of magnetic force visible that...

Dear all, Is there a single line way of using bash to take a file "filename" and display the line numbers of any blank lines within that file? Thanks, Natski

I'm not sure but I found this... [When an electron makes a transition from one energy level to another, the electron emits a photon with a particular energy. These photons are then observed as emission lines using a spectroscope. The Lyman series involves transitions to the lowest or ground...

For a field of 15 T, I calculated the magnitude of the splitting, which was 1.391E-22 J (this is delta E), i.e. delta E = |e| / 2m hbar B_z (m2 - m1) where m2 and m1 are the m_l levels. In order to determine the spacings for the visible lines on the absorption spectra, will that just be...

Homework Statement find the equation of the plane that contains the line r_1(t) = (t,2t,3t) and r_2(t)=(3t,t,8t) Homework Equations The Attempt at a Solution i don't know where to start...my book does not have an example similar. can somebody just point me to the right direction?

Homework Statement Find the equations of both the tangent lines to the ellipse x2 + 9y2 = 81 that pass through the point (27, 3). One is horizontal the other is not. Homework Equations The Attempt at a Solution horizontal, easy: y = 3 x^2+9y^2=81 derivative: 2x +...

Hi I'm trying to build a permanent magnet alternator with a different approach than usual. Most PMAs have a ring of magnets alternating north and south. But I'm wondering what would the field lines look like if ALL the magnets faced one direction? Would it provide a useful magnetic field, or...

Homework Statement Find parametric and symmetric equations for the line through P0 (3,3,0) and perpendicular to both given vectors (1,1,0) and (0,1,1) Homework Equations parametric: x=x0+at, y=y0+bt, z=z0+ct; symmetric: x-x0/a=y-y0/b=z-z0/c The Attempt at a Solution What is first...

ANSYS Help: Simple Modal Analysis of Plate I am modeling a plate (36"x3"x.25") in ANSYS. When I construct a line out of two keypoints and give the line a rectangular section, the analysis works and I can output modal displacements just fine. With these modal displacements I can plot the mode...

Homework Statement There are 3 parallel lines that are crossed by other 4 parallel lines. So the problem is: Write a formula by witch you can obtain the number of all parallelograms, if m parallel lines cross n other parallel lines. Homework Equations The Attempt at a Solution...

Homework Statement The problem has two thin metal bar electrodes, one setup to be positive and one setup to be negative. A metal circular disc is placed between the two bars. Why do the equipotential lines near the edge of the bar run parallel to the bar? The setup looks kind of like this...

Homework Statement Our lab is not online, but this is so similar to what we did. http://physics.fullerton.edu/~SAM/PDF/Lab%20Manuals/212/Individual%20Experiments/Equipotential%20Surfaces%20E6.pdf" Instead of the ten that they set their voltage to, we set ours to 12. Homework Equations...

Homework Statement A positive charge is placed in the center of a cube. Are the intersections of the field lines with a side of the box uniformly distributed across that side. Explain. === I have missed some lectures due to getting the swine flu (ugh) and the material is not exactly...

Homework Statement line l1 : x=2 y= -1 + p z= 2p line l2 : x=-1 + t y=1-3t z=1-2t Find the shortest (exact) distance between l1 and l2. Homework Equations That's what I am looking for! The Attempt at a Solution Thanks!

I understand that electric field lines do not cross and a simple explanation is that it violates existence-uniqueness. I'm thinking there is a more complete explanation out there though. I think the answer lies in the realm of dynamical systems and non-linear dynamics, but it's been a whlie...

Homework Statement The electric field from two charges in the plane of the paper is represented by the dashed lines and arrows below. Select a response for each statement below. (Use 'North' towards top of page, and 'East' to the right) The force on a (-) test charge at N is directed...

Like a radioactive particle emit rays, does this similar to the field lines of a charged particle? at what speed these field lines are generated from the charge particle?

what is the meaning of deceptivness of field line?? i mean for 2d surface field line = n/2pi*r (f.l. inversly proportional to r) but for 3d surface f.l.= n/4pi*r^2 (f.l. inversly proportional to r^2), since electric field = kq/r^2?? what is the reason behind it? it written in the...

Homework Statement http://img193.imageshack.us/img193/1066/65157866.png The Attempt at a Solution Since v is a constant vector, I took it out the front of the integral and used the ftc so the integral of the derivative collapses to γ(t) with terminals a to b. Evaluating leads to γ(b) -...

Are electricity and magnetism field lines the same? please be detailed!

After a rather interesting discussion in #math on freenode, I'm perplexed by the fact that there is no way to construct lines from points. For example, I initially thought of constructing a line between 0 and 1 by repeatedly dividing into two smaller halves, eg: 0,1 0,0.5,1 0,0.25,0.5,0.75,1...

I'm have some conceptual problems with electric fields and waves. When I think of electromagnetic waves I imagine field lines emanating from a charge that is oscillating, consequently causing the field lines to oscillate. In diagrams showing field lines, the electric field runs parallel with the...

I have a physics question that I'm hoping someone has enough free time and is intrigued enough to figure out for me! My sister just bought a house which is near some high voltage power lines. I've heard that people living near these types of lines can sometimes induce a current in wires...

Homework Statement an electric field line emerges from a positive point charge +q1 at an angle x to the straight line joining it to a negative charge -q2.at what angle y will the field line enter the charge -q2? Homework Equations The Attempt at a Solution sin(y/2)=sin(x/2)(q1/q2)^1/2

Not really sure if this is the place for this, but can overhead tranmission lines be located via sattelite imagery?

I've been thinking about this for some time now and I wanted to get some feedback on it. If photons are supposed to travel along straight lines (for the sake of simplicity let's neglect the curvature of space-time), then how could one photon possibly be used in a double slit experiment? More...

Homework Statement Given two lines, in 3D, connected end to end with lengths L0 and L1, a point P0 where the first line starts, and a point P1 where you want the end of the second line to be at. Find the configurations of the lines that put the end of the second line at P1. You can restrict the...

hello! im not very familiar with electromagnetic fields and classical physics, so i turn to you for help, a problem: assume you have a magnetic dipole in center (0,0) of a xy plane, i want to plot the vector of the field at an arbitary point on this plane,and to plot the filedlines, how do i...

1. Simplify each expression: 2 log49 - log23 2. none 3. 2 log49 - log23 = log481 - log23 = - log23 I get - log23 when it should just be log23. What did i do wrong? 1. Find the equation of the following circle: The circle that passes through the origin...

So I'm looking at this example in my textbook where they're trying to find the vert. & horizontal tangent lines of r = sin Θ, 0 < Θ < pi. they say to first change it to parametric equations where x = r cos Θ = sin Θ cos Θ and y = r sin Θ = sin Θ sin Θ = sin^2 Θ But now I'm just really...

You know how metal shavings form bows of flux lines. How is this possible since there are no discrete flux lines. I would think it should form a 2D gradient of shavings slowly graying out as they get further and further away. But you tend to see discrete lines as if at .4 inches there's a line...

why there is no magnetic lines of force through soft ring placed in a magnetic field ??

Im givin these two lines.. L1= x=4+5t y=5+5t z=1-4t L2= x=4+s y=-6+8s z=7-3s What i tried doing was taking the directional vector of both lines <5 5 -4> <1 8 -3>, and crossing them to find the normal vector. I hav enough information to find 1 equation of a plane, but how can I find the...

I'm taking calculus online and I need help figuring out how to solve the following problem. My book and notes given from my teacher do not show how to solve problems like this and I keep ending up with answers that don't work. The question is; Find f '(a) when f(t)=(3t+3)/(t+6)...

Homework Statement Show that the two lines: L1: x = t - 3; y = 1 - 2t; z = 2t + 5.. L2: x = 4 - 2s; y = 4s + 3; z = 6 - 4s... (I changed the t's to s's for L2) are parallel, and find an equation for the plane that contains them. Homework Equations A(x - x0) + B(y - y0) + C(z - z0) =...

Does anyone know a good reference for absorption lines in the Earth's atmosphere at visible and NIR wavelengths (if there are any)? For example, perhaps in the range of 3500 Å to 8000 Å? I find that the search terms are too broad to give me reasonable results on ADS. I found some atmospheric...

I have been coming across a very very basic mathematics problem and still can't get my head around it. Should admit not the best to really talk maths to but I need the following I am doing a collision detection algorithm.. For this I have a point that moves .I got the position of the...