For questions that utilize the concept of magnetic fields (commonly denoted by the letter B), or for questions whose answers likely involve magnetic fields. More specific than the [tag:magnetism], as questions about the phenomenon & theory of magnetism do not necessarily involve the discussion of ...

learn more… | top users | synonyms

0
votes
2answers
235 views

Magnetic flux density of a solenoidal electromagnet

I am designing an electromagnet which will be used to test magnetic sensors. So I used to formula found at hyperphysics which relates the magnetic field flux density to the number of turns, the ...
3
votes
3answers
509 views

How to find the direction of an eddy current?

Suppose there is a magnetic field going from left to right. Suppose a thin sheet of metal conductor (e.g. a 1m*1m square) is dropped through the magnetic field such that the plane of the conductor is ...
4
votes
5answers
711 views

In what case does a Coil with Current flowing through it NOT produce a Magnetic Field?

According to what I've studied, when Current flows through a Coil, a Magnetic field is produced. Recently, I've been told that there is a case in which Current flows through a Coil Without producing ...
0
votes
1answer
49 views

Is there an intuitive explanation for the direction of the B field around a wire?

A wire has cylindrical symmetry, therefore we should consider the possibility of the induced by field in the p,phi and z directions. I know from the right hand rule that we only get a field in the phi ...
1
vote
1answer
41 views

Will my data drives be safe in an emp event? [closed]

If there was an emp event (maybe because the rotation of magnetism of the earth or an atomic bomb) would the data on my hard drives, ssd, dvd, mini dvi tapes and cassette tapes be safe?
0
votes
1answer
47 views

Electric and magnetic fields with synchrotrons

Can anyone describe to me one change to the electric field and one change to the magnetic field that MUST take place as particles gains energy in a synchrotron accelerator? This could also just be an ...
2
votes
0answers
38 views

Landau levels in ferromagnets

Consider a spontaneously magnetised (uniformly) conducting ferromagnet. Now suppose that there is no external magnetic field. The question is as follows: will the motion of electrons be quantized via ...
-1
votes
1answer
30 views

Why is $\theta$$ = $$\theta$$_{2}$ and not Phi in this Magnetic Field due to Current in Loop Equation [closed]

I'm wondering how we know that $\theta$ = $\theta$$_{2}$ (essential to solving the problem) and that it is not equal to, for example, ϕ?
1
vote
1answer
236 views

$\pi$, $\sigma$ - atomic transitions with respect to the magnetic field axis

I am confused about the atomic transition with different polarized lights. I post the pictures as follows. There are four cases. In case 1, the right-handed circular polarized light ...
1
vote
1answer
101 views

Will a small magnet affect an insulated computer wire?

I'm designing something that involves a small magnet, probably about 0.5m in diameter, which will rest next to a computer wire carrying data, video, audio, etc. If the wire is insulated (think USB or ...
0
votes
0answers
35 views

Can measurement of Spontaneous Magnetization and susceptibility lead one to deduce the magnetic structure of a magnetic compound?

For a given magnetic compound, spontaneous magnetization and susceptibility are measured at various temperatures (in this paper). (SMS measurement) From neutron diffraction data the compound is found ...
0
votes
1answer
39 views

Does an infinite solenoid have constant magnetic field along its length?

So I'm aware of the fact that an infinitely long solenoid has radially uniform(constant) magnetic field inside. But does the magnetic field vary as one moves along its length? Reading the solenoid ...
3
votes
2answers
240 views

How strong would the Earth's “magnet” be if it was the size of a fridge magnet?

If you shrunk the "magnetic part" from inside the Earth down to a fridge magnet size, how strong would it be in Gauss? This is not a home work question. I just watched this video which included the ...
2
votes
0answers
25 views

Formation of vortices in superconductors

So I'm trying to understand how mixed state of a type II superconductor becomes the energetically favourable state. I've been through a simple approximate calculation considering a S-N boundary to ...
0
votes
1answer
61 views

Can an electric field help generate a current?

What i know or am guessing:- A moving/changing magnetic field creates an electric field. So if we take a rotating magnet near a coil of copper wire, it will induce a current right. So it means an ...
0
votes
1answer
49 views

The origin of Gauss' law for magnetism [closed]

What is the physical axiom leading us to the Gauss' law for magnetism?
0
votes
0answers
41 views

What physical properties affect magnetic attraction between a magnet and a surface?

What physical properties of a metal affect how strongly a given permanent magnet will be attracted to the metal? How do these properties relate to real-world materials that can be purchased either as ...
0
votes
1answer
57 views

Finding the limit for $\theta$

To find out the magnetic field for infinite wire, we can have an equation $$B= \frac{\mu_0 I}{4\pi s}(\sin\theta_2 - \sin\theta_1) $$ But how the limit of theta could be $\theta_1 = -\pi/2$ ...
0
votes
1answer
50 views

What is an awkward constant and is there a relation to ad-hoc hypotheses?

[I'm not entirely sure whether this is the right board, since it is not a technical but a soft question]. I'm reading the textbook "Spin Dynamics - Basics of Nuclear Magnetic Resonance", 2nd ed., ...
0
votes
1answer
37 views

Why is $\ell$ in $\mathbf F = I~\ell \times \mathbf B$ taken as shortest distance?

The equation $\mathbf F = I~\ell \times \mathbf B$ works good for a straight wire. But in cases where the wire is bent in the form of a sine curve or in a circle and the magnetic field is assumed ...
0
votes
1answer
37 views

How does one magnetic field effect another

Do the fields cancel or are they additive or something else. Can we direct and focus them and or amplify then with similar fields? Can we eliminate the electric portion of an electromagnetic field?
1
vote
2answers
42 views

Shorting a Superconducting Coil with A/C

When a superconducting coil carrying a direct current is shorted, it continues to carry the current without loss (approximately), assuming it stays cooled and superconducting. What would happen if ...
0
votes
1answer
16 views

Attracting atmospheric positive ions to carbon nano tubes for collection

Can nano magnets built into carbon nano tubes be used to attract moving positive ions from atmosphere to increase the resultant positively charged collecting mass?
1
vote
2answers
348 views

Does a changing magnetic field impart a force on a stationary charged particle?

Does a collapsing and re-establishing magnetic field impart a force on a stationary charged particle ? Does the charge particle get repelled and or attracted ? Does it move or spin ?
0
votes
1answer
77 views

Can a magnetic or electric field deflect subatomic particles?

I always wondered if the subatomic particles can be deflected by a magnetic or electric field. Basically I am asking the viability of the typical "Force Field" in movies.
0
votes
0answers
28 views

Induced emf around plane wing tips- varying magnetic field(revised)

I understand that a solenoid wire with an induced magnetic field can be subjected to a varying magnetic field. My question is if you can you have a varying magnetic field around the wing tips of an ...
1
vote
0answers
33 views

The Earth's gravitational magnetics [closed]

The Earth has magnetic properties correct, so can they be measured and if so what are some consistencies?☆
3
votes
3answers
125 views

Why not a magnetic field local maximum?

Reading a brief on magnetic traps I've read that you can't have a magnetic field local maximum. I believe this is linked to the divergence of B being 0 in vacuum, but I don't see why one can have a ...
0
votes
1answer
39 views

Is there a current in this situation?

If a wire moves through a magnetic field a current is induced in the wire. If you drop a piece of wire through a magnetic field, the wire is of a finite length and the whole length is shorter than ...
1
vote
0answers
92 views

interaction of permanet magnetic field with electromagnetic field

I am working on non contact breaking system for a rotating permanent magnet in an electromagnetic field.so I would like to know if the interaction between the magnetic field and an electromagnet will ...
1
vote
1answer
113 views

Probability current for electron in uniform magnetic field: wave function forever splitting apart?

In this document http://hitoshi.berkeley.edu/221a/landau.pdf on Landau levels, in section 4, page 19, "Transitionally invariant Gauge", they analyze the free electron in a uniform magnetic field ...
0
votes
0answers
20 views

What's the relation to calculate the magnetic field away from a magnet?

The relation to calculate the magnetic field generated in a point P in front of a solenoid is : $$ B= N \frac {\mu_0 I} {2a} sin^3(\alpha) $$ with the values' meanings shown in the image. Now what ...
0
votes
2answers
49 views

What is the optimal disposition of coil to maximize the magnetic field created?

I am trying to create a powerful magnetic field using coil, and possibly some ferromagnetic metal bars. The white box with the X on it, is empty, or made of air. Saying that I have no limits on ...
3
votes
1answer
126 views

If light is affected by gravity, does that mean gravity affects electrical&magnetic fields too?

Since we observed that masses indeed bend the light, and since we consider light to be composed of electrical and magnetic fields, does that mean a single point charge will result with bent electrical ...
0
votes
1answer
86 views

Number of states in a given Landau level

For an electron in a uniform magnetic field, in free space, we seek to find the number of allowed states in a given rectangle $L_x L_y$ (for some fixed Landau level). In effect we are tiling 2-D ...
1
vote
1answer
72 views

Equation to describe the magnetic field sensed by a magnetometer

There are a magnetometer and a magnet placed at some distance D from it. We can assume that the magnet is a generic bar magnet. We can also assume that the Earth magnetic field is zero since the ...
0
votes
1answer
44 views

Is the magnetic force on a current carrying conductor dependent on velocity?

A current carrying conductor is kept stationary in a region of uniform magnetic field, and another conductor, carrying the same amount of current, is moved with a certain velocity in a region of ...
0
votes
0answers
46 views

Using an Earth magnetic or electric field to fly [duplicate]

Are there possibilities to use the magnetic or the electric field of earth to let a matter flow in space?
1
vote
1answer
90 views

Can I create a static electricity water magnet?

I came to watch a video that water dipole get attracted by static electricity. I wanted to know if I could make a static electricity device that could pull out all the water from a wet cloth.
0
votes
0answers
75 views

A uniform magnetic field between two electromagnets?

Is it possible? And will the nature of source circumstantially affect the charged particles in that field?
1
vote
0answers
141 views

Can iron filings on a magnet be removed using a stronger magnet?

After some experiments, I had some NdFeB permanent magnets "contaminated" with iron filings, sticking to it's poles surfaces/edges - you may have seen that before. There are some working ways to ...
2
votes
0answers
49 views

Is there an orbit decay associated with synchrotron radiation of a relativistic particle?

I had a question about a particle (say a proton) with relativistic energies interacts with a magnetic field (in the z direction). As it is accelerates the particle emits synchrotron radiation. ...
1
vote
0answers
71 views

Can magnets induce magnetism stronger then their own magnetism?

This might sound foolish but bear with me for the explanation. I came across a weird magnetic behaviour playing with coins on a mac. There are magnets in mac, two on the top corners of the screen and ...
10
votes
1answer
619 views

Do particle accelerators centrifuge the quarks of a proton?

Is it right that circular particle accelerators use magnetic fields to deflect the particle beam? Using the simple equation of "a charged particle in a magnetic field": ...
7
votes
2answers
212 views

Flywheel energy storage: Why not use room temperature diamagnets instead of superconductors?

Flywheel energy storage has garnered some interest from academia and industry for its potential to store surplus electrical energy efficiently in kinetic form. Modern designs use magnetic bearings ...
7
votes
1answer
75 views

Do neutron stars emit stellar flares?

Since stellar flares are formed from the magnetic energy of a star, is it probable to assume that neutron stars can emit stellar flares as well? If so, how would the super fluid material of the star ...
2
votes
2answers
62 views

How magnetic field formed around Earth?

What are the factors that help the Earth to form a magnetic field around itself and why it is spread throughout from South to North?
0
votes
2answers
80 views

Ammeter with and without magnetic field

Is there any kind of ammeter that measures the current without using magnetic field? Can we deduce that presence of a magnetic field may interrupt current readings for normal ammeters?
0
votes
1answer
49 views

Magnets in microgravity

Lets say you were in a space station in microgravity. If you were to suspend a magnet in the air would it migrate slowly towards the nearest magnetic surface?
0
votes
1answer
49 views

What is a measure of how easy it is to magnetize a material?

Is there a measure (i.e. is there a word for..) how easy it is to magnetize a particular material? From some searching, I have found that 'coercivity' is a measure of how difficult it is to ...