Help Needed on Magnetism: Saturation, Coercivity and Energy Stored!

AI Thread Summary
The discussion focuses on the concepts of saturation, coercivity, and energy storage in magnetic fields, particularly in relation to a thought experiment involving magnetization. The user seeks clarification on the physics behind magnetizing an object, the potential energy stored in its magnetic field, and the effects of opposing magnetic forces on the internal structure of the magnet. There is a concern that energy invested in magnetizing may not be fully retained, as some energy could be lost to heat and other effects. The user expresses urgency in understanding these concepts to strengthen their university application. Accurate comprehension of these principles is crucial for effectively articulating their idea in their personal statement.
Patrick Tew
Messages
1
Reaction score
0
Urgent Help Needed on Saturation, Coercivity and Energy Stored in a magnetic field!

Hi guys,

I'm applying to university to study Natural Science and the deadline to apply is Friday. In my application it's crucial I demonstrate extra ability and I thought of using a recent idea I had when doing a thought experiment on magnets. But, since I thought of my idea, I have not been able to find the right resources to help me clarify my idea but I need to be sure of the physics so when I write the idea into the personal statement, I haven't said something that simply isn't true or I make a mess of explaining it. I'm desperate for some help on clarifying the physics of my idea, which goes as follows:

If you were to magnetize an object, you would do work to align it's domains. The energy invested would then be a kind of potential energy stored by the magnetic field. If you were then to bring this new magnet (1) to another magnet (2) facing opposite poles the two would repel each other. Increasing the strength of 2's magnetic field would increase the force between 1 and 2 until the force would be so big, it would cause a change to the internal structure of magnet 1, demagnetising it and so releasing the potential energy we invested into 1 to magnetize it in the first place.

Upon follow up of my idea, I thought this could be related/explained by saturation, coercivity and inductance, however having just come out of secondary school it's been hard trying to learn these concepts to understand if what I thought is correct.

Though this may be basic, poorly thought out or down right wrong, any clarification on if what I'm thinking is real physics would be massively appreciated as this could really effect my uni application! Thanks a lot!
 
Physics news on Phys.org


I THINK when you change the direction of the domains the energy isn't stored there, as it is used to overcome friction and othe effects. Most of it would be converted to heat I believe.
 
Thread 'Motional EMF in Faraday disc, co-rotating magnet axial mean flux'
So here is the motional EMF formula. Now I understand the standard Faraday paradox that an axis symmetric field source (like a speaker motor ring magnet) has a magnetic field that is frame invariant under rotation around axis of symmetry. The field is static whether you rotate the magnet or not. So far so good. What puzzles me is this , there is a term average magnetic flux or "azimuthal mean" , this term describes the average magnetic field through the area swept by the rotating Faraday...
It may be shown from the equations of electromagnetism, by James Clerk Maxwell in the 1860’s, that the speed of light in the vacuum of free space is related to electric permittivity (ϵ) and magnetic permeability (μ) by the equation: c=1/√( μ ϵ ) . This value is a constant for the vacuum of free space and is independent of the motion of the observer. It was this fact, in part, that led Albert Einstein to Special Relativity.
Back
Top