Magnetism Definition and 974 Threads

A wire 36m long carries a current of 22 A from east to west. If the maximum magnetic force on the wire at this point is downward (toward the Earth) and has a magnitude of 4.0E-2N, find the magnitude and direction of the magnetic field at this location. I have no clue where to start. What...

Which is the correct equation for Magnetic Reluctance ? R = Reluctance l = Length A = Area \mu = Magnetic Permeability of the material \mu_0 = Magnetic Permeability of free space ( 4\pi \times 10^- ^7 tesla/ampere turn) R = \frac {l} {\mu A} as stated on Wikipedia or R =...

Could someone help me with this problem? I don't really know how to do it.. http://www.webpost.net/bl/bluesoda025/magnetism.gif What is the magnitude and direction of force acting on wire 1 due to the magnetic field produced by wire 2?

Hi. I'm having some trouble with this problem: An electron accelerated from rest through potential difference 1.6 kV enters the gap between two parallel plates having separation 20.0 mm and potential difference 120 V. The lower plate is at the lower potential. Neglect fringing and assume...

Hi, I'm new to this site. Anyway, I am studying for the MCAT right now and the physical science review that I have been doing has gone pretty well, I just have a few questions about comparisons that can be made between movement of electrons and movement of solid objects. 1) What is the...

1. Is Ampère's law (\nabla \times \mathbf{B} = \mu _0 \mathbf{J}) consistent with the general rule that divergence-of-curl is always zero? Show that Ampère's law cannot be valid, in general, outside magnetostatics. Is there any such "defect" in the other three Maxwell equations? I'm not...

A horizontal rod is moved northward at a constant velocity throough a magnetic field that points straight down. Which statement is true? a) The West end of the rod is at higher potential than the east end. b) The East end of the rod is at higher potential than the West end. c) The top...

Does magnetism have any affect on gravity?

I was wondering if anyone could help me with a question. I am a long time knife collector, and after a block of steel is formed it gets demagnetized...after the steel block is then ground into shape and finally sharpened on a grinder, it some how becomes slighty magnetic. Knife makers say its...

Let's say you have two magnets of the same magnitude facing each other, North facing South. At a certain distance, with let's say and iron filling placed at a certain spot, is there a spot where the net magnetic force exerted on the filling will be zero?

Problem 1: A proton is shot with a speed of 8x10^6 m/s at 30 degrees to an x-directed field with B=.15 T. Completely describe the path followed by the proton. Describe the path in words and also give the radius, the period, and the pitch. The proton is going to take a spiral - screwdriver...

I'm having trouble starting this problem... I'm pretty sure I'll be able to figure it out if I can just get past the first question. I scanned the sheet because I'm lazy and I thought that you'd be able to understand the problem better that way anyways. So if someone could just point me in...

Answered Finished! Thanks to all that helped out.

electrons and magnetism. - need help. An electron moves with velocity v = (4.0i – 6.0ij) x 104 m/s in a magnetic field B= (-0.80i + 0.60j) T. Determine the magnitude and direction of the force on the electron. F=ma: qvB=m*v^2/r : r= mv/qB r = (9.1E^-31kg * (4.0i – 6.0ij) x 104 m/s) /...

Hey this is more of a general question than a problem... What happens to a human body after it has reached its magnetic exposure limit (.2 Telsa)? Does the magnetism pull iron out of the blood stream, or cause any severe or fatal health issues? Something must happen, or else there would be no...

First off I am sorry for asking this question , as I am sure I am way off base. I collect high end pocket knives and some of the blades have become a little magnetized; so i found a demagnetizer that uses NdFeB30 magnets, which are rare earth? MY question is this, if i rub the demagnetiser over...

I am currently working on a problem that states... An electron experiences the greatest force as it travels 2.0x10^6 m/s in a magnetic field when it is moving southward. The force is upward and of magnitude 2.3x10^-12 N. What is the magnitude and direction of the magnetic field? I started...

Here it is... The diagram shows a current balance loop that includes the conductor where l1 and l2 represent the segments of its length. You have been asked to do an experiment that anazlyzes the relationship between magnetic field strength and current in a solenoid by plotting a graph...

Hello I've run into quite a few crappy diagram questions on my Homework assignment due tomorrow. All of the questions are from my school's (Central High Sedgewick) webpage. The teacher thought she'd be sly and hide the answers on some of these questions. The webpage is this...

Hi my grade 11 physics class is on its final unit (Electricity and Magnetism) and I am a little lost... So far we are doing Charge and Voltage (we learned the formulas)... and we're expected to know that circuit diagram stuff and Ohm's Law? lol a bunch of stuff we were suppose to learn in grade...

Hello, I was wondering if you guys know any websites/ free books/ any other ressource about physics electricity and magnetism, since this is my next class and I want to try to read about it before starting. I have download an e-book from the sticky, but I'd like other sources. feel free to...

I have a huge problem to work out.. but first, i can't find the equations for (1) electrostatic potential of the center of a square (a charged particle at each vertice) and (2) the magnitude of electric field at the center of the same square. These are both questions to two...

HELP - Magnetism Physics Problem! The problem says: A long piece of wire with a mass of .100 kg and a total length of 4.00m is used to make a square coil with a side of 0.100 m. The coil is hinged along a horizontal side, carries a 3.40-A current, and is placed in a vertical magnetic field...

ok, sorry if I'm posting this in the wrong place but move it to the right one and whateve. Anyway, I may have no idea why I'm talking about, using incosistent models or something, in which case I would appreciate it if you told me. Okay, if opposite charges attract, why not different quantum...

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.

It’s interesting that MOND splits Newtonian gravity into two cases and the Modified version of Newtonain dynamics seems to happen in galaxies and clusters of galaxies with magnetic fields.What is the physical reason that MOND could be right? If we assume that there is another force interacting...

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??