Magnetism Definition and 949 Threads

Homework Statement Two long parallel wires, each with a mass per unit length of 40g/m, are supported in a horizontal plane by 6 cm long strings, as shown in the figure below. Each wire carries the same current I, causing the wires to repel each other so that the angle (theta) between the...

A friend and I have been discussing what we think is an error in our textbook (either that or a misunderstanding on our part). The book gives an example in which two protons are initially traveling parallel to one another in the same direction with equal velocity. We think that since the...

Questions #1: Will a nail be attracted to either pole of a magnet? Explain what is happening inside the nail when it is placed near the magnet. My answer: Yes, the nail will be attracted to either pole of a magnet because the nail is neutral and has no charge whatsoever. When a magnet is...

Homework Statement We need to find magnetic North and south on some different solenoid arrangements (meaning the wires are arranged in pointing in different directions) Homework Equations The Right Hand Rule for Solenoids The Attempt at a Solution In class we were told the...

If you place a metal ring in a region in where a magnetic field is rapidly alternating, the ring may become hot to your touch. Why? Is it because a changing magnetic field can create electric fields? I AM SO CONFUSED...and it seems so simple?!?

Homework Statement Two long parallel conductors carry currents I1 = 3.00A and I2 = 3.00 A, both directed into the page as shown below. Determine the magnitude and direction of the resultant magnetic field at P. Homework Equations B = uI/(2*3.14*r) u = 1.26*10^-6 T*m/A The Attempt at a...

Please; 12.5 kiloGauss = how many lbs pull . I want buy a bunch of 3/8" x 1/4" NEODYMIUM magnets. Some sellers designate Gauss, other lbs pull. Also, any tips on where to buy? Thanks!

Homework Statement Image: http://img.photobucket.com/albums/v696/talimtails/PP23.jpg A particle with unknown mass and charge moves with a constant speed v = 1.9 x 10^6 m/s as it passes undeflected through a pair of parallel plates, as shown above. The plates are separated by a distance d...

I mentioned neutron scattering (or in particular, inelastic neutron scattering) as being one of the most important experimental technique in studying the magnetic properties of matter. This is true if the material has some ordered magnetism. This technique has been used to show the ordered...

Homework Statement Two identical conducting spheres each having a radius of .5 cm are connected by a light 2.3 m long conducting wire. A charge of 53 uC is placed on one of the conductors. Assume that the surface distribution of charge on each sphere is uniform. Determine the tension in the...

Homework Statement Five point charges on a straight line are separated by a distance of 0.01 m. For what values of q2 and q4 would the net force on each of the other three charges be zero? q1-----q2-----q3-----q4-----q5 Where: q1= 2x10^-6 C q3= 1x10^-6 C q5= 2x10^-6 C Homework...

Homework Statement An alternating current I cos wt flows down a long wire and returns along a coaxial conducting tube of radius a. Find E assuming E→0 at ∞. Homework Equations The Attempt at a Solution I did the problem from Griffiths but have some problem to understand the...

Homework Statement The following problem from Griffiths is irritating me for a long time… A toroidal coil has a rectangular cross section, with inner radius a, outer radius a+w, and height h. It carries a total of N tightly bound wound turns, and the current is increasing at a constant rate...

I have a few questions. They are very basic and stupid but I need to understand. Please correct me if I am using wrong terms or some of my facts are wrong. The first one is about potential energy. Now, imagine a ball is held up high above the ground. You would say it has potential energy, that...

Does anyone know where I can find some comic strips about electricity and magnetism.

magnetism and electric fields Hello all. I'm new to this, but I would really appreciate any help, I'm absolutely terrible at physics... 1) In a trial of Millikan's oil drop experiment, we find that the electric field required to suspend a tiny oil particle with mass 1.46x10^-14 kg is...

-------------------------------------------------------------------------------- Dear All, A confused fellow from the old United Kingdom here. I have a question regarding magnetism. Is it possible to create a magnet that will have a 'pulling power' of greater that 600 pounds? I am not asking...

Isn't Gravity and Magnetism free energy? How does it follow the conservation of energy rule?

An electron is placed in a magnetic field B that is directed along a z axis. The energy difference between parallel and antiparallel alignments of the z component of the electron's spin magnetic moment with B is 4.50 10-25 J. What is the magnitude of B? energy=Beh/4pim 4.5e-25 = B...

INTRODUCTION: Hi, here i am stuck with a few problems. One from Magnetism and the rest from Optics. THE PROBLEMS: (1) A wire PQ of mass m can slide frictionlessly on two conducting rails spaced a distance l. A current i flows on into the wire PQ with the help of a current generator.There is a...

The correct derivation of magnetism as a relativistic side effect of electrostatics: http://chip-architect.com/physics/Magnetism_from_SR.pdfI've claimed quite a few times here that Purcell's derivation is not correct. Making claims is one thing. Better is to pinpoint exactly what is wrong, and...

Please refer the doc attached. The document is available at http://physics.weber.edu/schroeder/mrr/MRRhandout.pdf It explains magnetism and radiation as a consequence of SR. In the section for magnetism, it is depicted that, with respect to test charge Q, the distance between the -q...

Magnetic fields arise because of moving charges which is the existence of a current (given by Ampere's law). Alternatively, a magnetic dipole is set up as a result of a charge moving around in a circular loop. So it follows that magnetism occurs from moving charges moving in different ways...

How many planets do we know of that actively have thunder storms? If possible please go into detail about the strength and occurance of these thunder storms on alien planets.

"An alpha particle is accelerated in the +x direction through a voltage of 1000V. The particle then moves in an undeflected path between two oppositely charged parallel plates in a uniform magnetic field of 50 mT in the +y direction. (a) If the plates are parallel to the xy plane, what is the...

Magnetism and Current Carrying wires (?) I have a homework problem my teacher gave and warned us it was "Very difficult". I've tried drawing out the forces and i think i have made some headway but the vector-nature of magnetism confuses me... For example, i see in some solutions the forces...

This is kind of like the chicken or the egg problem. I want to know if there is an established scientific opinion regarding this question.

Lithium-6 ions (mass is 6x a proton mass) are charged Li+ ions (one extra proton). They are accelerated by 2000 volts and passed through a velocity selector with a magnetic field of 0.020T into the page. The ions follow a straight path through the selector and are then deflected onto a piece of...

how do i find the b field of two perpendicular wires. suppose one wire is pointing out of the page and the other one is going from left to right. I am looking for the magnetic field between them. o (wire going out of paper) B=? xxxxxxxx (wire going left to right)

hey I am looking for a little help with some physics questions. if you can help me please either respond with the answers or e mail me at ... <email-deleted>. 1. a curcular current loop made of flexible wire is located in a magnetic field B; you may keep B constant or vary it. Describe three...

Line Integral and Magnetism Help! Here is a problem given to me as a takehome quiz I am having trouble even starting being that I missed that day we went over line integrals. Any hints or tips are much appreciated. http://ez-files.net/download.php?file=4ec07c5df1e8223123523fb11f038d39"

Problem: A fixed loop with Radius a and Resistance R is parrallel with the y-z plane. Another loop with radius r parallel to the y-z plane and a distance away from the other loop has a velocity v moving toward the other loop. What is the induced Voltage? Assuming (Told to assume this)...

this is not a school project its trying to find some answer or paper on: if magnetism can or can not bend space. the closest theory that I've found is: Theodor Kaluza (1885-1954) attracted the attention of the physical community since 1921 with his unified field theory of gravitation and...

Ok I'm not sure this is in the right forum, and this is a very broad question; I'm just starting to understand magnetism and its relation to the universe. This is basically a bunch of conjecture on my part, could you tell me if I am anywhere near the mark? The way I imagine it is this: There...

A copper bar has a constant velocity in the plane of the paper and perpendicular to a magnetic field pointed into the plane of the paper. If the top of the bar becomes positive relative to the bottom of the bar, what is the direction of the velocity ~v of the bar? 1. from right to left 2...

I am going through Olivier Kahn's book "Molecular Magnetism". I am stuck on something that seems so simple. On page 10, it is stated that \chi=C\sum_{M_S=-S}^{+S}\frac{{M_S}^2}{2S+1} The book then states that this leads to \chi=\frac{C}{3}S(S+1) I've tried to figure the steps between...

I've already taken the test but this is lingering in my head. We have two electrons in an area of 0 magnetic field. One electron is at rest while the other is moving westward. We then apply a magnetic field B moving eastward. What direction are the electrons moving? Note: No direction...

A couple of questions. 1. A capacitor of capacitance C is discharging through a resistor of resistance R. When will the energy stored be equal to half its initial value? My logic went like this: Energy in a capacitor (U) = Q^2/2C so: Q = (2CU)^0.5 so therefore the charge when the...

A solenoid 2.9 cm in diameter and 15 cm in length has 300 turns and carries a current of 5 A. Calculate the magnetic flux through the circular cross-sectional area of the solenoid. -->> I tried using the equation B = u(0)NI/L to calculate magnetic field, and then putting this in the formula...

What force is stronger, Gravity or Magnetism? I know that magnetism in general is stronger here on Earth but what about by the event horizon of a super massive black hole?

Physics 122 Course by Frank L. Wolfs (homepage - http://teacher.nsrl.rochester.edu/) Department of Physics and Astronomy University of Rochester http://teacher.nsrl.rochester.edu/phy122/Phy122HomePage.html#info Course notes [see post #4 for revised link]

simple question: how does an electron's spin create magnetism?

I am sorry to be bothering you - I am a high school student and I need help with something I don't understand. It is understandable if we think of why magnetic fields form closed loops if we think of the North and the South Poles not being separate from each other. This has been given as a proof...

Hey everyone, wondering if anyone knows if it's possible to remove the magnetism from a magnet through use of electicity. Specifically using 12volts, 2.5 amps DC. I'm looking for some kind of switch, or converter etc, that would remove the magnetism, but obviously I don't know exactly what...

An electron of mass 9.11 x 10-31 (9.11e-31) kg travels in a circular orbit within a large evacuated chamber. The orbit has a 2.0 mm radius and is perpendicular to a B-field of 0.030 T. What's the electron's speed? For this problem, the only equation i can think to apply is F=qvB. I know...

I've been demonstrated that magnetism is a consequence of special relativity, with a given single example. I'm more and more insterested with the subject and eager to read any text on the topic --I'm tired of empirical magnetism! If you know any freely available resource/paper on the subject...

The return stroke of a bolt of lightning typically carries a peak current of 24 kA up from the ground. What is the maximum magnetic field associated with the bolt 1.4 m away?l; I'm just having trouble finding the right formula for this problem is the correct formula B= (4pi x 10^-7* I)/2pi...

http://img63.imageshack.us/img63/2876/q16vq.jpg http://img334.imageshack.us/img334/6094/q29ae.jpg http://img334.imageshack.us/img334/7461/q39az.jpg I tried many methods but i keep getting a different final answer can anyone help? Please!

The potential is constant throughout a given region of space. Which of the following statements is true? Be sure you can justify your answer. 1. The electric field is zero in this region. 2. The electric field may have places where it is zero, and places where it is...

The coil wrapped around a magnet is attached to a battery (one end of the coiled attached the positive end of the battery and same goes to the negative side). I am confused with the right hand rule. Your thumb is to point to North, but North is what? The positive side of the battery? As you know...