Magnetism Definition and 974 Threads

Hello Guys I am a new joinee and this is my first question. I apologise if the question is little trivial. Basically, Think of the following: Scenario: There is a strong bar magnet and some magnetic metal balls lying on the floor of a room. Step 1: I lift the magnet from the floor and...

This article is an abridged version of the original article posted in google groups and is attached to this post. For further proofs or clarifications regarding this article, please download the attached file titled electrodynamics and magnetism.pdf. I am not sure whether this article should...

If I were to build a solenoid for the sake of making an electromagnet with a core shaped like the one below, would it create the desired effect? CRUDE! :-p Cross-sectional view of my idea. What I'm asking is, would the inner edges of that gap (the sides closest to the center) be one...

Homework Statement It is a multiple choice question. The picture shows two bar magnet attracting each other. A charge is placed in the middle of the distance between the two magnets. [S-Magnet-N] >>>> (-C) >>>> [S-Magnet-N] >>> = direction of field lines. (-C) =negative There is no...

Hi guys, I have chosen the variation of magnetic field strength under different temperatures for my high school physics experimental investigation. We had a guassmeter at school, however it has had a few problems, and so I've dicided to use a compass. My question is, how do i use the angle of my...

Has anyone ever come across any research or articles concerning the effects of the initial blast and fallout of an nuclear weapon and its effects on surrounding magnetism? Theories are welcome too, but research is preferred.

if electromagnetism is mediated by photons, what do photons have to do with magnetic fields? more specifically, what is a magnetic field "made" of? surely there aren't photons released by an ordinary household magnet? i have a vague understanding that magnetic attraction has something to do...

Homework Statement a loop of conducting wire approaches a constant magnetic induction into the paper, which is perpendiciular to the plane of the loop. How does the speed at which the loop enters the field compare with the speed at which it approaches the field? Homework Equations...

I dabble in miniature milling/machining with my home CNC setup. I'm building a low temperature engine and have a question. The piston will be a neodymium magnet(s) set in graphite. Rather than using mechanical linkages and a crankshaft I want to use magnets to control the length of throw. By...

I understand that the electromagnetic field and light are tied together, and they all travel through big groups of photons and they all travel at the speed of light. And I get that light travels through empty space. But I am wondering what does electricity and magnetism travel through...

I just need help on how to solve these problems. I am so confused with the directions that i just don't get it... 1) A long straight wire is aligned north-south and carries current in the northerly direction. What is the direction of the magnetic field created directly abvove the wire...

hello, I am not too sure of how charged particle got to do with magnetism. "Magnetism is a force of attraction or replusion that acts at a distance. It is due to a magnetic field, which is caused by moving electrically charged particles or is inherent in magnetic objects such as a magnet."...

Ok I need a bit of help with my Physics 212 homework.I know I am supposed to list my guesses and all available formulas,but my my problem is I don't actually know where to start.I didn't find any example of these in the book so I am just kinda stumped.I suppose my big problem is that I am...

You have two like charges with the same velocity and a displacement between them perpendicular to the velocity. Moving charges produce a magnetic field. The charges should magnetically attract one another. Now consider the reference frame of the charges. There is no motion so no magnetic...

First off, thanks for taking the time to read this. I am not a Physics Major, I am not a scientist. I do try to think a great deal about our existence, and what our future holds as far as discovery, so therefore, I have something to present. It is hypothetical, but please play along with it...

Homework Statement A circular loop carries a current I. It is placed in a constant magnetic field in such a way that the field lines are perpendicular to the plane of the circle. What is the force on the loop? Does the magnetic field have any effect on the loop described? Homework...

Homework Statement A particle of mass m and charge q is projected into a region having a perpendicular magnetic field B.Find the angle of deviation of the particle as it comes out of the magnetic field if the width d of the region is very slightly smaller than a)mv/qB b)mv/2qB...

Homework Statement On crystal which containing ions V^{4+}, electronic configuration 3d^1, was applied magnetic field B_0=2,5T. If the temperature is 1K, find the relative concentration of electron states population \frac{N_2}{N_1}. In what temperature we should expect 99% ions in ground...

Could you please also tell me where (else) the third law fails?

Homework Statement The 10-turn loop of wire shown in the figure lies in a horizontal plane, parallel to a uniform horizontal magnetic field, and carries a 2.0 current. The loop is free to rotate about a nonmagnetic axle through the center. A 50 mass hangs from one edge of the loop. What...

Homework Statement What speed would a proton need to achieve in order to circle Earth 1670 km above the magnetic equator, where the Earth’s mag- netic field is directed on a line between mag- netic north and south and has an intensity of 4.1 × 10−8 T? The mass of a proton is 1.673 ×...

Homework Statement Given: A tightly wound circular coil has 81.9 turns , each of radius 0.1 m. The uniform magnetic field is in a direction perpendicular to the plane of the coil. The field increases linearly from 0 T to 0.851 T in a time of 0.364 s . What E is induced in the...

Is it correct to say that all materials exhibit some form of magnetism? I was reading on Wikipedia that there are different kinds of magnetism (Ferromagnetic, ferrimagnetic, Paramagnetic, Diamagnetic) and that all materials exhibit at least one of them.

1.In a television set, electrons are accelerated from rest through a potential difference in an electron gun. They then pass through deflecting plates before striking the screen. (a) Determine the potential difference through which the electrons must be accelerated in the electron gun in order...

HI, So say you have a small ball hanging vertically below a positively charged plate. When the ball is released from rest with the string at a small angle to the vertical, it swings in periodic pendulum motion. If the ball is now positively charged, does the period increase, decrease or stay...

Two magnet I put nearer to each other in such a way that there is a repulsive force between them. Both the magnets have some potential energy with respect to each other. I keep magnet in this position for a long time & so magnetic field became weaker & so magnet have less amount of potential...

good afternoon, these are my problems, I already tried to solve them but my anwers isn't well: 1-the electrical potential at certain distance of a charge of 600 V. and the electrical field is 200 N/C. At what distance of this charge is it necessary to place a charge of 0.1x10 ^-6 C and the...

Homework Statement A 2 kg particle carrying a charge of 97 uC enters a uniform 7 T magnetic field at a speed of 26 m/s and with an angle of 52o with respect to the field lines, as shown in the figure. Answer the following questions: A) The work done by the field on the particle is zero as...

Imagine a metal hoop floating in a plane parallel to the Earth's surface, with a permanent magnet suspended above it. The magnet is then dropped straight through the center of the hoop. From Faraday's Law, a current is induced in the hoop as the magnet passes through. There is now angular...

I'm a first year undergraduate taking my first electricity and magnetism class, and going through all the classic material: Coulomb's law, electric fields, flux, capacitors, etc. And the book I have explains the material relatively well, but I feel like I'm missing out on so much by just being...

1. Homework Statement Two straight wires, each with a resistance of 0.170 ohm and a length of 3.90m, are lying parallel to each other on a smooth horizontal table. Their ends are connected by identical, non-conducting, light springs, each spring having an unstretched length of 1.08 cm. A wire...

Hi All, I understand that the the speed of electrons in a wire along with the coulomb attraction accounts for the attraction of two wires carrying current in the same direction and the repulsion of two wires carrying current in the opposite direction; however, I'm having trouble visualizing...

As you probably know, there is a formal proof of Gauss's Law for electric fields based on Coulomb's Law and the concept of solid angles. How can one prove Gauss's Law for magnetic fields? Is there a similar proof based on solid angles?

Can anyone say what magnetism is beyond that it is a field and a property of the electrical nature of atoms? That is why do magnets attract? How is it different from gravity?

Homework Statement teacherweb.com/CT/TrumbullHS/.../APOralFinalQuestions1-10.doc for pic. The magnitude of the magnetic field in teslas at a distance d from a long straight wire carrying a current I is given by the relation B = 2 X 10-7 I/d. The two long straight wires shown above are...

Does gravity affect the way magnets interact with one another? Would the same magnet be stronger in a low gravitational field (just empty space) compared to let's say jupiter?

I completely made this question up because it's related to class and it will help me understand the lesson better and more. Explain the work of scientists and how they revolutionized scientific thought. Include Max Plank, Einstein and Michelson-Morley. The work doesn't have to be only about...

Something Vexing me about Magnetism and Conservation of Energy I have been thinking about an issue at work and it has been bugging me so I thought I would post something on here to see if anyone can explain where my thought process is going wrong. Say you have a super conducting magnet...

hi, I'm having trouble understanding what the difference is between the B and H fields. What my understanding is, if you have a magnetic dipole on its own, its going to have some B field around it. Then say you bring some material into the field, and the field within the boundaries of the...

Hello there, I would like to just say before beginning that this is an excellent forum, and I have found it invaluable as a prospective physics student. I'm looking for an undergraduate Electricity & Magnetism text which will lead me into, and through, my Physics degree. Just a bit of...

Can anyone explain to me why does a watch stop when it is brought near a magnet?I want to know how does the magnet affect the watch.

Homework Statement A child sleeps at an average distance of 30cm from household wiring. The mains supply is 240V r.m.s. Calculate the max possible magnetic flux density in the region of child when the wire is transmitting 3.6 kW of power. Thats the first part. I don't really understand...

Homework Statement Two wires have a current going through them and each wire is suspended by a string from the ceiling. Wire 2 makes an angle of β with the vertical and Wire 1 makes and angle of θ with the vertical. (see the attached picture for further clarification) L 1(length of...

I sincerely intend for this not to be a rant, please do not take it in this way. Well, the first half of my physics B AP class is over. We are all done with mechanics (/happyface) and now we are going to start part 2: Electricity and Magnetism. Mechanics was very hard for me. Why? I have no...

Maxwell's "A Treatise on Electricity and Magnetism" I bought this book as a supplement to my electromagnetism I class, but the moment Maxwell goes into anything mathematical, I'm lost. The lack of illustrations and reference to many out-dated terms makes the book hard to follow. The book is a...

Hello, Im struggling with a pretty horrendous lecturer for this 2nd year course, so am trying to learn a lot of it myself with a decent textbook. I am getting pretty scared for the exam in summer. We have been reccomended Jewett & Serway, but its kinda just a general physics, and doesn't seem...

A straight wire carrying a current of 48 A lies along the axis of a 4.9 cm diameter solenoid. The solenoid is 55 cm long and has 250 turns carrying a current of 5.0 A. 1)What is the magnitude of the magnetic field 1.3 cm from the wire? (in mT) 2)Estimate the magnitude of the magnetic field...

electricity and magnetism HELP! hi, I am trying to studying physics 2 (electromagnetism) before next semester. the school uses college physics by serway, which is just not working for me do you have any recommendations of books that will supplement the material on a conceptual basis? is the...

First year studying Physics at university. I've got my first E&M assignment and it's about charged plates but the thing is, I'm certain we haven't covered most of what it is asking, and I can hardly find any (simple) explanations to what I'm meant to do or methods I'm meant to use. I wasn't...