Magnetic fields Definition and 674 Threads

Hi, does anybody know what approach to take with the following problem. An electron is accelerated from rest through a potential difference of 500V, then injected into a uniform magnetic field. Once in the magnetic field, it completes half a revolution in 2 ns. What is the radius of the...

An article by W Tucker and K Tucker at NASA says that neutron stars have magnetic fields. If a magnetic field is created by moving charges, and neutron stars have not net charges to move, how are the fields created?

Is a magnetic field carried by a particle? If two north ends of a magnet are brought together they push apart as if they were two rivers meeting head on and if a north pole and a south pole are brought together it is like two rivers flowing together in the same direction. What are these...

It seems that a great deal of research has and is being conducted with regards to generating magnetic fields of enormous density. What is the aim of this research, or is just "pure" research? In other words, is there any speculation that such fields locally distort space-time or could...

How do I determine how much current a wire can safely handle? I made some electromagnets with some coil and 9 volt batteries, but the wire and the batteries get real hot after a minute, which I assume is not good so i don't keep it connected for long. I want to know how much the wire I am using...

I have a few problems that I'm not sure how to do (not sure what equations to use), can anyone help me? 1) At a certain location, the horizontal component of the Earth's magnetic field is 2.3 x 10^-5 T, due north. A proton moves eastward with just the right speed, so the magnetic force on it...

A 1.59 m long wire weighing 0.0668 N/m is suspended directly above an infinitely straight wire. The top wire carries a current of 32.4 A and the bottom wire carries a current of 24.5 A. Find the distance of separation between the wire so that the top wire will be held in place by the magnetic...

For what reason is a magnetic force vector perpendicular to the magnetic field vector and the velocity vector of a charged particle? I know F=qvBsin and how to compute cross products but why does the force make a particle move in that particular direction? Is relativity involved?

Near the Earth's equator, the Earth's magnetic field is approximately horizontal. What current would have to flow through a long wire with a mass density of 10g/m to keep the wire floating in mid-air? What would be the direction of the wire, and the current in the wire? Well, I know I'd...

Hi, I'm currently doing an research experiment into the behaviour of plasma around magnetic fields. I will be using an arc welding machine for the plasma and an electromagnet. (So I can adjust the field's intensity as an independant variable.) The arc should bend in the presence of a magnetic...

Here's my problem: A particle with charge 4.5E-19 C travels in a circular orbit with radius .465 m due to the force exerted on it by a magnetic field with magnitude 1.7 T and perpendicular to the orbit. a) What is the magnitude of the momentum p of the particle? I used the equation...

Here's my problem: A particle with charge 4.5E-19 C travels in a circular orbit with radius .465 m due to the force exerted on it by a magnetic field with magnitude 1.7 T and perpendicular to the orbit. a) What is the magnitude of the momentum p of the particle? I used the equation...

I have been driving myself crazy trying to figure out this problem, for a while now. I just can't get the right answer. should the number of turns be multiplied or divided by the radius? Please help me out. Two circular coils, concentric and lying in the same plane, produce magnetic...

Howdie all, I'm soo glad I found this forum, people are genuinely working together instead of ignoring their fellow physics brethren =) A pair of square parallel conducting plates, having sides of length .05 meter, are .01 meter apart and are connected to a 200 volt power supply. An electron...

Does the following equation mean that electric field E and magnetic field B are always perpendicular?? the equation is: Curl E = - (partial derivative of B with respect to t) where E is time dependent too.

I've read in my textbook in the elecromagnetism chapter, when a particle is negative and goes through the magnetic field the velocity is opposite to the current...I don't really understand this, can someone please explain this?

Are fields like magnetic fields made of particles/waves that travel from the source outwards? For example, if you put an obstacle(that would not let photons pass) between the source and a charged object, would the charge be affected? Or do fields interact with objects independantly from what's...

I have simple question here that I've been wondering about for sometime now, and here it is. In classical physics when an charge is accelerated it creates an oscillating electric field which creates an oscillating magnetic field, a electromagnetic wave, and each field carries energy with it. So...

[SOLVED] Magnetic fields qustions I don't understand the correlation between the two following source of magnetic fields: 1- Electric Dipole 2- Moving Electron I can't build a concept that allows me to explain them both! Are they both caused by moving electrons? #2 is by definitions...

Didnt think that this should go in the theoretical physics section, but if it should feel free to move it. We all know that a large gravitational field can bend light, but my question is would it be possible for a large enough magnetic field to bend light? I know that this doesn't happen...

Hiya ppls! I have some questions about magnetic fields and current flows in general. Lets say in these eg., A vertical wire carries a current straight up in a region where the magnetic field vector points due NORTH. What direction of the resulting force on this current? EX1) No using...

My physics teacher gave the class a brief explanation of a permanent magnet. If I understood him correctly he basically said the special condition with a permanent magnet is that all the electrons are circling uniformly (in same direction). The poles of the magnet are based on the direction the...

I've recently heard someone discussing the effects of pulsed magnetic fields on aluminum. Thats really something I hadn't thought about, but would a pulsed magnetic field on the order of 1 Tesla cause a reaction in Aluminum? How about Stainless Steel? I know these materials usually show no...

It is a known fact that neutron stars and pulsars, remnants of super nova explosions, have very strong magnetic fields. It is said that the collapse of the core amplifies the magnetic field of the progenitor. This is due to the fact that the magnetic fields lines are drawn closer together during...