Magnetism Definition and 949 Threads

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?

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...

Can someone explain this video: If I put this together myself should I expect it work or is that some hoax? If that's just a normal use of magnetism, then where can I read more about the principles behind it? Do these magnets get weaker over time?

Feel Free to give tips or answers to any or all of these questions Homework Statement 1. Two Point charges qa and qb are located on the x- axis at x=a and x=b on the graph of E the x-component of E. a) What are the signs of qa and qb? b)What is the ratio of|qa/qb|? c) Draw a graph of...

Homework Statement In a certain region, the Earth's magnetic field has a magnitude of 5.5 x 10-5 T and is directed north at an angle of 40° below the horizontal. An electrically charged bullet is fired north and 19° above the horizontal, with a speed of 700 m/s. The magnetic force on the...

May be a trivial question... The forces that arise from the magnetic field are Lorentz forces that not make mechanical work. When a piece of iron is attracted by a magnet is accelerated and its kinetic energy increases: Who does the work necessary?

Homework Statement A toroidal solenoid has a 60cm inner diameter and a 65cm outer diameter. The toroidal solenoid has 200 turns and carries a current of 30 Ampere. Determine the range of values for B inside the toroid. Homework Equations Ampere's law for toroid: B = Uo*N*I/2*pi*r where Uo =...

Homework Statement Calculate the potential energy, by ion, in an infinite bi-dimensional ionic crystal. Hint : Use the power series expansion of \ln (x+1). Homework Equations \ln (x+1)=\sum _{i=1}^{\infty} \frac{(-1)^{i+1}x^i}{i}. The Attempt at a Solution W=U=k\sum...

I'm confused as to wither or not magnetic fields do work. From reading the forums, as well as my textbook and online resources there seems to be conflicting answers. We talk about magnetic energy, and how work relates to change in energy but then I hear that magnetic fields do no work. Could...

If you fire energetic ionising particles, like electrons or protons, at a stationary target, the important interactions are ionisation, nuclear reactions and scattering. But if the incoming particles are traveling at high speed, will they not generate a high magnetic field? Why is such a...

Alright, so magnetism, this weird force that just seems to occur at the end of a lump of magnetic metal. I understand that: - The movement of electrons "facilitates the occurrence" of a force called magnetism - Magnetic materials have unpaired electrons in their shells which all have the same...

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

Homework Statement Ok guys, this problem has a few steps to it, and id appreciate any help I can get. Ok, so beam of electrons moving left, positive particles with same but opposite charge moving right, both moving at 1x10^8 m/s. Then there is a proton moving left on top of the beam nearby...

I plan to use a automatic genset controller to protect/run a synchronous generator. This controller determines when to disconnect the starter by determining the generator frequency. I plan to connect the exitor regulator to the main breaker so when the main breaker trips the regulator is shut...

Hi, I have a couple of questions here: 1st, I never really understood how magnetism induces current, like how does magnetic fields just suddenly cause electrons to flow. Another question I have is on how transformers work (the electric device, not the robots). I looked at some explanations...

does the fact that a moving charge creates a magnetic field, and a moving magnet creates an electric current, imply that the two are related or inverses of each other? -Tom

I've seen in feynman and on the internet a derivation that the force on a negatively charged particle from neutral current carrying wire can be shown to be purely magnetostatic in one frame of reference and purely electrostatic in the other frame of reference using the length contraction. The...

I just saw an instructor of EEE (YouTube) talk about Cross Product. He gave an example of when cross products are used. Here's what he said. He drew a vertical arrow and said this is current. Then he drew a circular arrow around the vertical line and said it is B. Then he drew a smaller...

What if i was traveling in a car with an e- with me. W.r.t to a positive charge at rest , it would seem accelerating to me i.e. it would have a magnetic field but acc. to a person on the ground it would just have an electric field. If there were a car moving relative to me , the person would...