Magnetism Definition and 974 Threads

I'm a freshman in college with only AP physics knowledge, and I'm curious about many aspects of physics. One of the thing that sparks my interest is magnetism and I was wondering if it is possible to have magnetic or electromagnetic force exerted on non-metals (maybe even noble gases). It would...

On these problems all i can figure out is which formula to use..after that i am completely lost..I don't really like physics, the whole pick the right formula for the given problem is too confusing for me... Problem 1) I think its Fmag= q*velocity*B*sin(theta) or would it be Fmag=...

1. wHAT ARE ENERGY SOURCES AND POWER STATIONS? 2.WHO WAS THE FIRST PERSON TO DISCOVER THE ENERGY SOURCE? 3.WHO BUILT THE FIRST POWER STATION AND WHO DISIGNED IT? 4.WHY DID HE/SHE DECIDED TO BUILD THAT POWER STATION THERE? 5.WHAT DO SOUTH AFRICANS GAIN FROM THAT POWER STATION? 6.IS THERE...

In magnetism , mH = F, where m = pole strength ; H= magnetic field intensity ; and F = Force. F = [ MLT^{}-2] Proof that dimension of mH = [MLT^{}-2]

Homework Statement A magnetic field has these components: x: B = 0.056 T y: B = 0.046 T The particle has a charge of +6.5e-5 C, has a velocity of 2.6e3 m/s, and is moving along the z axis. Questions: 1: What's the magnitude of the net magnetic force on the particle? 2: What's...

Hello, this is my first post here. I'm building an electromagnet as part of a larger experiment in my lab. My magnet needs to move a magnetic thread made with a paramagnetic substance. This string just barely responds to strong magnetic fields (tested it with standard speaker magnets). The...

Hi Does anyone have a link to a proof that magnetism is a result of relativistic effects on a moving charge? I am sure that I have seen one but I can't find it. Thanks John

I have always wondered, what causes magnetism? I have only high school level physics at the moment, so I do not know the "whys". WHY do two opposite magnetic poles attract, and likes repel?? And where does a magnetic get its energy to say, cling to a fridge?! Or is there something...

folks, in higher secondary books i came across magnet's length that is bar magnet's length is given as " 2l" that is 2 multiplied by l. my question is " why the length is not referred as 'l' the usual way of referring length. please clarify in layman terms. thanks in advance logesh aravindan

What is magnetism exactly? I understand it is a portion of the electromagnetic force of a moving charge directed to where it used to be.

hi, i have a question that i don't really get, so anyone to help? Explain, using the domain theory , why heating or dropping a magnet can cause it to lose its magnetization? thanks to anyone who would help

Homework Statement One method for determing masses of heavy ions involves timing their orbital period in a known magnetic field. What is the mass of a singly charged ion that makes 7.0 revolutions in 1.3 x 10^-3 seconds in a 4.5 x 10^-2 T field. a) 2.1x10^-25 kg b) 1.3x10^-24 kg c)...

Homework Statement Question 1- Magnetized Ship You are standing on a shore beside a shimmering blue sea. You will go on a sea expedition to Magnesia and claim the lost treasure of Magnesia. Magnesia is an island which lies near the Antarctica. The only way to get there is by sea. The ship...

Temperature effect on magnetism. The curie point for mild steel is about 750deg C. Before this temp it is ferromagnetic and after that temp its paramagnetic i think. But my question is does the magnet permiabilty of the mild steel gradualy reduce as it gets hotter up to that temp? If...

I always have found magnetism hard to understand. Maybe even harder to understand than quantum mechancis? This could be spurred from the fact that my command of vector analysis isn't great. How do I develop an intuition for magnetism?

I reread certain parts of Griffith's 'introduction to electrodynamics' out of interest in relativity in electrodynamics and was wondering the following. In the last chapter Griffiths shows that the magnetic field of a current carrying wire can be shown to be the electric field arising due to...

What causes the attraction or repulsion between magnetic poles? Answer this from the perspective of an electron. There are two kinds of electric charges: positive and negative. • Charges exert forces on other charges at a distance. • The force is stronger when the charges are closer...

I know that electric fields generate magnetic fields (when you put a compass next to a wire that has current in it the needle moves indicating that a mag. field is present). I know that changing magnetic fields can generate electric fields or induced emf. What does electromagnetic waves...

Homework Statement A long straight conductor carries a current I.Determine force per unit length of the conductor when it is placed in a unifrom magnetic field B. Homework Equations The Attempt at a Solution I got BI sin(theta) where theta is the angle between wire and the B...

Hey everyone, I have a few questions. What is the link between electricity and magnetism? Why would moving electrons(current) create a magnetic field? Why does a moving magnetic field induce a current in a conductor? Thanks for responces.

Homework Statement A compas needle points 20 degrees East of North outdoors. However, when it is placed 8cm to the east of a vertical wire inside a building, it points 55 degrees east of north. what is the magnitude and the direction of the current in the wire? the Earth's field is 5.0E-5...

I have a couple of questions in E&M. a)Can anyone tell me what a coaxial resistor and a coaxial capacitor looks like? (Approx Diagram) Because I am not sure which equations apply to them since I am not sure what they look like. b)How do I find a self energy of a charged sphere? Split it into...

Hey guys. I am perhaps in the wrong section but the coursework help forum didn't seem right. My question is concerning the decrease in magnetism of an electromagnet. I have a ball hanging from an elctromagnet which will have the power source removed instantly. There may be some delay...

Homework Statement A compass needle points 20 degrees E of N outdoors. However, when it is placed 8.0 cm to the east of a vertical wire inside a building, it points 55 degrees E of N. What is the magnitude and direction of the current in the wire? The Earth's field there is 0.50 x 10^ -4 T and...

Homework Statement Two long parallel wires, each with a mass per unit length of 40g/m, are supported in a horizontal plane by 6 cm long strings, as shown in the figure below. Each wire carries the same current I, causing the wires to repel each other so that the angle (theta) between the...

A friend and I have been discussing what we think is an error in our textbook (either that or a misunderstanding on our part). The book gives an example in which two protons are initially traveling parallel to one another in the same direction with equal velocity. We think that since the...

Questions #1: Will a nail be attracted to either pole of a magnet? Explain what is happening inside the nail when it is placed near the magnet. My answer: Yes, the nail will be attracted to either pole of a magnet because the nail is neutral and has no charge whatsoever. When a magnet is...

Homework Statement We need to find magnetic North and south on some different solenoid arrangements (meaning the wires are arranged in pointing in different directions) Homework Equations The Right Hand Rule for Solenoids The Attempt at a Solution In class we were told the...

If you place a metal ring in a region in where a magnetic field is rapidly alternating, the ring may become hot to your touch. Why? Is it because a changing magnetic field can create electric fields? I AM SO CONFUSED...and it seems so simple?!?

Homework Statement Two long parallel conductors carry currents I1 = 3.00A and I2 = 3.00 A, both directed into the page as shown below. Determine the magnitude and direction of the resultant magnetic field at P. Homework Equations B = uI/(2*3.14*r) u = 1.26*10^-6 T*m/A The Attempt at a...

Please; 12.5 kiloGauss = how many lbs pull . I want buy a bunch of 3/8" x 1/4" NEODYMIUM magnets. Some sellers designate Gauss, other lbs pull. Also, any tips on where to buy? Thanks!

Homework Statement Image: http://img.photobucket.com/albums/v696/talimtails/PP23.jpg A particle with unknown mass and charge moves with a constant speed v = 1.9 x 10^6 m/s as it passes undeflected through a pair of parallel plates, as shown above. The plates are separated by a distance d...

I mentioned neutron scattering (or in particular, inelastic neutron scattering) as being one of the most important experimental technique in studying the magnetic properties of matter. This is true if the material has some ordered magnetism. This technique has been used to show the ordered...

Homework Statement Two identical conducting spheres each having a radius of .5 cm are connected by a light 2.3 m long conducting wire. A charge of 53 uC is placed on one of the conductors. Assume that the surface distribution of charge on each sphere is uniform. Determine the tension in the...

Homework Statement Five point charges on a straight line are separated by a distance of 0.01 m. For what values of q2 and q4 would the net force on each of the other three charges be zero? q1-----q2-----q3-----q4-----q5 Where: q1= 2x10^-6 C q3= 1x10^-6 C q5= 2x10^-6 C Homework...

Homework Statement An alternating current I cos wt flows down a long wire and returns along a coaxial conducting tube of radius a. Find E assuming E→0 at ∞. Homework Equations The Attempt at a Solution I did the problem from Griffiths but have some problem to understand the...

Homework Statement The following problem from Griffiths is irritating me for a long time… A toroidal coil has a rectangular cross section, with inner radius a, outer radius a+w, and height h. It carries a total of N tightly bound wound turns, and the current is increasing at a constant rate...

I have a few questions. They are very basic and stupid but I need to understand. Please correct me if I am using wrong terms or some of my facts are wrong. The first one is about potential energy. Now, imagine a ball is held up high above the ground. You would say it has potential energy, that...

Does anyone know where I can find some comic strips about electricity and magnetism.

magnetism and electric fields Hello all. I'm new to this, but I would really appreciate any help, I'm absolutely terrible at physics... 1) In a trial of Millikan's oil drop experiment, we find that the electric field required to suspend a tiny oil particle with mass 1.46x10^-14 kg is...

-------------------------------------------------------------------------------- Dear All, A confused fellow from the old United Kingdom here. I have a question regarding magnetism. Is it possible to create a magnet that will have a 'pulling power' of greater that 600 pounds? I am not asking...

Isn't Gravity and Magnetism free energy? How does it follow the conservation of energy rule?

An electron is placed in a magnetic field B that is directed along a z axis. The energy difference between parallel and antiparallel alignments of the z component of the electron's spin magnetic moment with B is 4.50 10-25 J. What is the magnitude of B? energy=Beh/4pim 4.5e-25 = B...

INTRODUCTION: Hi, here i am stuck with a few problems. One from Magnetism and the rest from Optics. THE PROBLEMS: (1) A wire PQ of mass m can slide frictionlessly on two conducting rails spaced a distance l. A current i flows on into the wire PQ with the help of a current generator.There is a...

The correct derivation of magnetism as a relativistic side effect of electrostatics: http://chip-architect.com/physics/Magnetism_from_SR.pdfI've claimed quite a few times here that Purcell's derivation is not correct. Making claims is one thing. Better is to pinpoint exactly what is wrong, and...

Please refer the doc attached. The document is available at http://physics.weber.edu/schroeder/mrr/MRRhandout.pdf It explains magnetism and radiation as a consequence of SR. In the section for magnetism, it is depicted that, with respect to test charge Q, the distance between the -q...

Magnetic fields arise because of moving charges which is the existence of a current (given by Ampere's law). Alternatively, a magnetic dipole is set up as a result of a charge moving around in a circular loop. So it follows that magnetism occurs from moving charges moving in different ways...

How many planets do we know of that actively have thunder storms? If possible please go into detail about the strength and occurance of these thunder storms on alien planets.

"An alpha particle is accelerated in the +x direction through a voltage of 1000V. The particle then moves in an undeflected path between two oppositely charged parallel plates in a uniform magnetic field of 50 mT in the +y direction. (a) If the plates are parallel to the xy plane, what is the...

Magnetism and Current Carrying wires (?) I have a homework problem my teacher gave and warned us it was "Very difficult". I've tried drawing out the forces and i think i have made some headway but the vector-nature of magnetism confuses me... For example, i see in some solutions the forces...