Magnetism Definition and 949 Threads

URGENT! about iron and magnetism can u explain briefly the magnetism of iron? i know that some iron ore--haematite and magnetite r called natural iron, but what contribute to the magnetic behaviour of iron? and, what r the application of iron? all i could find from the internet only gives a...

Magnetism: Magnetic field between wires Two long parallel wires are a distance of d = 1 cm apart and carry equal antiparallel currents of 8 Amperes. Find the magnetic field intensity (in T) at the point P which is equidistant from the wires. (R = 10 cm). This should be easy but I haven't...

I understand that no conclusive theory on magnetism has been formulated yet. But i was wondering if it did answer this question. If the electrons orbiting the nucleus give a magnetic material its magnetic properties. Then why of all atoms would Iron or nickel be the few which possesses...

Problem concerning magnetism. **Please help A 13 ohm square loop, whose dimensions are 4m x 4m, is placed in a unifrom .14T magnetic field that is directed perpendicular to the plance of the loop. The loop, which is hinged at each vertex, is pulled as shown (it is being tugged from the...

Another magnetism question A particle of mass 7 kg carrying a charge of 82 micro-Coulombs enters a uniform B field of intensity 9 T at a speed 92 m/s and at an angle of 25° with respect to the field lines as shown in the figure. (Positive y is up positive x is right the field is pointing in...

This is a prelab question for a lab I'm supposed to do tomorrow but I feel like I'm so baffled at how simple the question is that I'm afraid to put down an answer for fear of misunderstanding the question: The Earth's field appears as it were produced by a strong permanent magnet embedded in...

Hello all, My physics group is planning an experiment that involes the effects of magnets on fluid dynamiscs in a weighless enviroment. Unfortunately, we, and our advisor, are unsure if gravity has any effect upon a magnetic field. Anybody know? thanks

What causes magnetism?

A bit weird magnetism problem... You see i have a problem... Assume the below situation in which there are 4 magnets above a wire and connected to a wheel of some sort. Now, once the wheel is in motion, Each set of the magnets have one strong and one weak magnet. In the first set, the strong...

we can calculate the charge flown through a wire loop by the formula change in magnetic flux divdided by the resistance of the loop in deriving this case we have neglected the self induction of the loop as df/dt =iR df/dt...

Hello, I was wondering if anyone has any links to any Electricity & Magnetism tutorials. I don't understand very well and was hoping for maybe an online book or something. Our lecture textbook sucks. We are doing Gauss's Law. Thanks!

" A 1.5-m length of wire carrying 6.5 A of current is oriented horizontally. At that point on the Earth's surface, the dip angle of the Earth's magnetic field makes an angle of 40 degrees to the wire. Estimate the magnetic force on the wire due to the Earth's magnetic field of 5.5*10^-5 T at...

"a conducting slab has infinite extent in the x and y directions and thickness L in the z direction. The slab is centered at z=0 and carries a uniform current density J=Ji where i, j, and k are unit vectors in the x, y, and z directiosn." -Find the magnetic field B at all points. -A square...

help! questions on electricity and magnetism 1. What is the frequency of the magnetic filed if it is know to be perpendicular to the electric field. The magnetic field is 0.00178T and the electric field is 8000V/m. 2. I just need the angle for this one. At a certain location, the...

1. A 10.9E-6 particle with mass 2.80E-5kg moves perpendicular to a 1.01 magnetic field in a circular path of radius 26.6m. How fast is the particle moving? How long will it take the particle to complete one orbit? I used v=rqB/m and got the wrong answer for velocity and I have no idea...

What exactly is that tuging / repelling force that you feel when you hold a pair of magnets close together ? Also what is the attracting / repelling force formula with regard to distance between them ?

ive been doing some thinking to a question brought up by my advanced physics teacher...i can't really back up any of my responses though...any help on whether electricity and magnetism are more alike or different?

It is an experimental fact that the strength of a magnetic field is inversely proportional to the temperature of the field generator. Can we conclude from this that the hotter an object is, the weaker is its magnetic field. Conversely, the colder an object is, the stronger is its magnetic...

why does Earth's magnetic field flip polarity at regular intervals?does it have any effect on the biosphere. are we in the midst of a flip as a recent programme in discovery channel suggested?thak you.

When analyzing a coaxial cable and trying to find the B field in the space betwen the outer and inner cables, using ampere's law the B field will be depedent only upon the current running through the inner wire. Why is this? I know that yes Ampere's law says that only the current contained...

Magnetism is still a big mystery. This is due to the fact that the source of it cannot be found, the magnetic monopoles. It can be theorized that magnetism is the key to understanding the concept of perpetual motion. It seems that the magnetic field is always in motion. This motion is...

What is the actual force of magnetism? Why are two permanent magnets attacted to each other? What is the relationship between a permanent magnet and the Earth? What is the relationship between the Earth's magnetic field and the Sun? What is the relationship between a permanent magnet and an...

Hey all, we are doing a unit in magnetism right now in school...some of it really baffles me. like why a metal coil when induced with a current and placed over a magnet will spin. And another thing I don't get is: If you take a magents with a N and S end, and cut it in half, you get two...

why can certain metals be magnetised but others like copper cannot? what what is the difference between permanent magnet and temporary magnets?

would non magnetic matters be affected by magnetism? and why? and why do the Earth have a natural magnetic field??

Magnetism and magnetic force are typically explained by the resultant effect on moving charges. Is anyone aware of any reseach, studies or literature that quantifies the interactive forces between two or more magnetic objects without utilizing the effect on moving charges to explain interactive...

Hi, lately, me and my friend wanted to build a monorail. suspended by magnets, and powered by electricity. we can't manage to create propulson. The Question? What shape and how are electric fields formed? P.S. Please don't call me a simpleton, I'm only fifteen.

What are magnets, how do they form, how do they attract and repel?

The Earth's magnetic field in this city points towards the north pole and downwards into the ground. The horizontal portion of the Earth's magnetic field is 12.5^10*-6 T and its angle of declination is 22.5 degrees(the angle east of north) What are the eastern components of the Earth's magnetiv...

anyone familiar with this place in florida and the theories on magnetism the man whou built it espoused? http://www.fortunecity.com/greenfield/bp/16/coralcastle.htm

If I have a simple bar magnet which is say 'w' x 'h' metres in dimension placed on a plane, say at cartesian coordinates (xM, yM), how can I work out the magnetic field strength at some arbitary point (x, y) also on that plane. I've searched the internet but can only find equations to do...

Not even sure where to begin with this question: Estimate the magnitude of the potential difference produced by the motion of a conductor in the Earth's magnetic field for which B is 4.3x10^-5T and the angle of dip (the angle it makes with the horizontal) is 60 degrees. Take as an example a...

Hey everyone, I'm a little stumped on this one, maybe someone can help. I don't need someone to do it for me, just maybe start me in the right direction. The American physicist E. H. Hall discovered (1979) that when a current travels along a conducting plate of width l, which is...

This question appeared in the physics exam yesterday and I'm not sure what is the correct answer. The figure shows a light and flexible conducting loop C freely hung on a smooth horizontal rail. A bar magnet PQ approaches the loop from the right. Which of the following descriptions about this...

A stream of protons passes a given point in space at a rate of 10 E9 protons/second. What mafnetic fiel do they produce 2.0 m from the beam? i think i would use I= 1.6 E-19x10 E 9 and then B=(permativity of free space x I)/(2pir) using 2.0 as r? am i totally off or close?

A stream of protons passes a given point in space at a rate of 10 E9 protons/second. What magnetic field do they produce 2.0 m from the beam? Kind of know where to start, but not exactly. the current would be 10 E9 multiplied by 1.6 E-19 i think. and then i think i would use B=(permativity...

Problem 1. A proton moves perpandicularly to a magnetic field that has a magnitude of 4.70*10^-2 T. What is the speed of the particle if the magnitude of the magnetic force on it is 2.12*10^-14 N? Answer in m/s. Note: What formula should I use? Problem 4. A proton moves straight...

Well, are they?

I was wondering if someone knows how nature tornados affect different materials magnetic properties? Is there any published litterature on this subject?

I just finished a Physics course in Electricity and Magnetism and never worked so hard for a 'B' in a class. I'd really like to go over the material once more to get a better handle on it during our break. I was thinking that a fresh approach with a different text might help, so I was hoping I...

I hope this is the right Thread for this discussion. I was wondering by what actions do Planetary Bodies, such as the Earth, continue in their orbits, millenia after millenia and so on, without decaying and being "sucked" into the Sun, in a rather short period of Time. Something doesn't add up...

I place two permanent magnets on a desk so that their poles are orientated for attraction. I take my hands away and they move towards each other. Where does the energy come from? Are the magnets now slightly less magnetic?

i saw an article the other night on public television of the Earth's decreasing magnetism. does anyone have an idea what is going to happen in the next thousand years to the Earth's "blanket"? i understand it will renew back, as it has many times in the past, although the poles will shift, but...

Rewritten and placed in the thread titled, "A little critique on magnetic lines of force", in the Teory Development Forum.

Magnetic Monopoly Suppose you bent a long thin magnet around to make a closed loop. All the magnetic field would be contained in the body of the loop but outside the loop you would have a vector potential circulating around the body of the loop. The vector potential can circulate because the...

A circular loop of wire of radius .5m is in a iniform magnetic field of .30T. the current in the loop is 2A. what is the magnetic torque when the plane of the loop is parallel to the magnetic field? Ok i first misread this and assued that it meant parallel or sin(90 degrees) which equals 0...

http://www.geocities.com/bridgestein/Bffield.jpg (copy and paste the above address to your browser please) In fact I know the answers of this problem, but I have a question. Here's the question. A charge +q moving with constant velocity v enters into a uniform magnetic field region as...

Magnetism Related Questions, Please Help! There are three questions that I need help with, all of which are focused on the main topic of Magnetism (The Magnetic Force on Moving Charges). Before I begin, I would just like to thank anyone that will be able to provide me with some assistance in...

I have seen what I seem to remember a disc made of super conducting material levitating over a substance I seem to remember as some form of liquid gas. Is there anyone who could please clue me into what I was observing and how it operates? Does what I observed somehow relate to opposing forces...