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 ...

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71 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.
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66 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?
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90 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 ...
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0answers
37 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. ...
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56 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 ...
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1answer
605 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": ...
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2answers
148 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 ...
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1answer
70 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 ...
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2answers
58 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?
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2answers
49 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?
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1answer
41 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?
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1answer
44 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 ...
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41 views

Magnet enters Solenoid Question

A magnet is moved towards a free to move stationary solenoid (lets say it's lying on a surface) with an open circuit (the ends are not connected). Will the solenoid move? What I do know: If the ...
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0answers
33 views

Induced emf by an induced emf

A time varying magnetic field will produce an induced emf in a closed loop. This induced emf will in turn produce an electric current which itself will produce a magnetic field. My questions are: Is ...
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1answer
178 views

Repulsive Force between two Electromagnets

This question might seem a bit too basic(or advanced!), but it is the one to which I'm really desperate to find a simple enough explanation and solution. Ok, So here's the problem, I have two ...
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56 views

Magnetic Field acting at a distance or near field induced ?

Are a magnetic's field lines of force due to mass acting at a distance or are there near field kinetic particles supplying the force along the lines of the field ?
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2answers
98 views

Source of energy for magnetic work?

I set two magnets on my desk such that they are experiencing attraction to each other, but due to friction with the desk, are just outside of the distance where they would snap to each other. Then I ...
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1answer
60 views

Effects of magnets on memory cards

I have always believed in keeping magnets and data storage devices far away from each other. Friends say I'm excessively cautious about it, but I seem to have a lot less data loss than they do! As ...
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0answers
42 views

What happens to a superconductor levitated by a spinning magnet?

What happens to a superconductor that is being levitated by a magnet that is spinning? Will the superconductor be stable or oscillate?
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0answers
36 views

Permanent magnet inside hollow toroid magnet

A random question, but what would happen if you put a permanent magnet inside a toroidal electromagnet? Inside the windings, not in the center of the donut. Since there's not really a defined north or ...
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1answer
46 views

Does the Earth's magnetic field sort cosmic rays by charge?

The Earth is struck by both negative and positively charged particles. As these particles interact with the Earth's magnetic field they become deflected. Do the magnetic poles of the Earth receive ...
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0answers
27 views

Dipoles in an external rotating field?

Consider a bunch of magnetic dipoles in $x-y$ plane in an external magnetic field $B(t)=B_0 \hat{z}+B_1(\cos\omega t~\hat{x}+\sin\omega t~\hat{y})$. The dipoles are rotating around $z$ axis and of ...
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3answers
334 views

Verification of Lenz's law in magnetic induction

So the device is a Galvanometer. According to the Lenz's Law, when we take the magnet towards the coil, the pole at the right end, should be north pole and when we take it away, the pole should be ...
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1answer
47 views

What makes B-field not be arbitrarily large very close to an electric conductor?

Assume an inifinitely long, straight thin electrical conductor with current I. It follows from Ampere's law that the B-field intensity is proportional to 1/r, where r is the distance from the ...
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1answer
150 views

Is the retentivity of soft iron more than that of steel?

Permanent magnets must have high retentivity and high coercivity and steel is used as one. So it should have higher retentivity.
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27 views

Diamagnetic Sphere Moving through Solenoid

I've seen the videos of frogs being levitated due to diamagnetism. What happens if the frog (or another diamagnetic object) enters a solenoid with an initial velocity? Specifically, consider a ...
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2answers
73 views

Entropy reversal in magnets

Entropy is an irreversible phenomenon without any energy supplied to reverse it. I was reading about paramagnetic substances and how dipoles align inside them on application of magnetic field. My ...
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0answers
69 views

Calculating the force applied by an electromagnet on a ferromagnetic object [closed]

I know how to calculate the force applied on a magnetic object by an electromagnet at $n$ metres distance using $$F = \frac{(N \cdot I)^2 \cdot k \cdot A} {2 \cdot g^2},$$ but how would one calculate ...
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2answers
146 views

Why in electrostatics is $dV=-E.dr$ but in electromagnetic induction, $EMF=+E.dS$?

In electrostatics we learned that $$dV=-E.dr$$. I understood the derivation which was used to derive this. Now when I have come to Electromagnetic Induction,I see that when there is a time varying ...
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0answers
24 views

Could the assumption of superconductivity explain unexplained geomagnetic behaviors?

Science recently published an article regarding a new discovery in superconductivity; that the metallic form of hydrogen sulfide is superconducting at high temperature (relative to absolute zero). ...
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2answers
118 views

Magnetic Force Confusing Paradox

Actually I had posted a very similar question, but I wasn't quite satisfied with the answer so I am posting a new variety again. Imagine an infinitely long wire carrying current $I_1$ from West to ...
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2answers
180 views

Earth's magnetic field shields us… from what threat?

This is a nice artistic picture of the magnet field of the earth, shielding us from the solar wind. (source) Wherever you look, it is stated that without our shield, life would not be possible on ...
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1answer
27 views

Does resonant inductive coupling work in the presence of a strong magnetic field?

Does resonant inductive coupling work in the presence of a strong magnetic field? I am unsure because resonant inductive coupling uses magnetic fields to transmit power wirelessly and a strong ...
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2answers
187 views

Showing that the magnetic field inside an infinite current carrying cylinder is zero

I'm doing some self studying of introductory physics, and was working a question from a textbook that has several parts. The first few parts asked me to show that the magnetic field of an infinite ...
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3answers
74 views

Does a magnetic field disentangle an EPR pair?

The spins of the both electrons of an EPR pair are undetermined before one conducts a measurement on one of them. Does a magnetic field determine (set up or down) the spin of one partner of an EPR ...
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1answer
75 views

Sequential Stern-Gerlach devices - realizable experiment or teaching aid?

At least one textbook [1] uses sequential Stern-Gerlach devices to introduce to students that the components of angular momentum are incompatible observables. Viz., the $z$-up beam from a SG device ...
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1answer
314 views

What causes the sharp borderline at the bottom of northern lights?

The northern lights are caused by cosmic charged particles interacting with the earth's upper atmoshphere. The particles can be trapped by the Lorentz force, so that we can see them where the magnetic ...
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0answers
44 views

Which part of a real Type II Superconductor magnetization loop represents the Meissner state?

So if we consider an ideal type II superconductor the magnetization should look like this The Meissner state is to be found between $0$ and $H_{c1}$ and the superconductor works as an ideal ...
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3answers
249 views

Rate of Acceleration of an Object Pulled by Magnetic Force

Gravity on earth pulls objects toward it with an acceleration of 9.8 m/s/s on Earth until the object reaches it's max potential free fall speed. (I call this terminal velocity though I think that this ...
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2answers
56 views

Magnetic force storage or amplification question

all forms of energy can be stored or amplified for example : capacitor , hydraulics ,laser , pulley , etc.. what is the equivalent to that for magnetic force ? can magnets be connected in series or ...
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2answers
118 views

Most fundamental quantity in magnetostatics and magnetodynamics [closed]

In both elctrostatics and electrodynamics, the electric charge is defined as the most fundamental quantity. What is the most fundamental quantity in case of magnetostatics and magnetodynamics ?
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2answers
90 views

how to know which side of a peranant magnet is which?

How to determin which side of a magnet is North and Wich side is South? It is my first time asking so I don't know if it is the right place to ask.
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0answers
70 views

Question about defining potential energy of a magnetic dipole placed in a magnetic field

We know that magnetic field is a non-conservative field, since it exists in closed loops. Then how can we define the potential energy of a magnetic dipole placed in a magnetic field ?
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1answer
43 views

Induction equation in a rotating frame

In his book, Tom Cravens refers to the induction equation (perfectly conducting limit) in a rotating frame, the Sun. See link below: ...
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0answers
45 views

Finding the magnetic field due to a current carrying field at a point within the circumference

This is a question me and my friend were wondering about. How can one calculate the magnetic field due to a current carrying loop at a point in the area enclosed by the loop. For example, at point P ...
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1answer
102 views

Two Current Carrying Loops: Multiple Choice Question

I'm studying some simple multiple choice questions from an old test in electrostatics and I have some trouble intuitively grasping this question. I hope someone can explain the solution! Two current ...
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36 views

Gaussian acceleration of magnetic/nonmagnetic balls

https://youtu.be/CoHGGZfERE0?t=19s In this video, 19 seconds in, a nonmagnetic ball (henceforth just called a ball) is launched slowly at a static magnetic ball butted up against another static ball. ...
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21 views

Could diamagnetism be used to create an airbag for your internals?

Could a massively strong magnetic field be used to shield a human body from the effects of excessive +/- accelerations? My understanding is that say for a pilot suitably strapped in that the strain ...
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1answer
26 views

What is the magnetic property of an alloy?

If an alloy is made between a diamagnetic and a paramagnetic substance or paramagnetic and a ferromagnetic substance or a diamagnetic and a ferromagnetic substance, what will be the resulting magnetic ...
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1answer
52 views

Why does the axle need to be rotated in a turbine generator?

Inside a turbine a wire rotates between the poles of a magnet, i.e. rotating inside the magnetic field, so that the field forces the electrons in the wire to move and generate current. But why does ...