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## Earnshaw's theorem

en.wikipedia.org/wiki/Earnshaw's_theorem

Earnshaw's theorem states that a collection of point charges cannot be maintained in a stable ... It is usually referenced to magnetic fields, but was first applied to electrostatic fields. ... ...

## Since magnetic field lines are just constructs the field cannot contain ...

Since magnetic field lines are just constructs the field cannot contain energy? ... Magnetic Field Lines Show Magnitude and Direction: When the lines of the ...

## Electric Field Lines - The Physics Classroom

www.physicsclassroom.com/class/estatics/Lesson-4/Electric-Field-Lines

Since electric field is a vector quantity, it can be represented by a vector arrow ... Not only does the density of lines surrounding any given object reveal ... Consequently, the lines representing the field cannot cross each other at any given location in space ... But what if a region of space contains more than one point charge?

## Chapter 24: Magnetic Fields

where high-energy particles travel. ... have made an electromagnet by winding wire around a nail and connect- .... Just like a tiny compass needle, the iron filing rotates until it ... The direction of a magnetic field line is defined as the direction in .... temporary magnet, after the external field is removed, the domains return.

## Magnetism | WyzAnt Resources - Tutors

www.wyzant.com/resources/lessons/science/physics/magnetism

If a charge is moving it still has an electric field, it is just that the electric field ... How magnetic fields lines are generated from moving charge sources is ... magnetic fields are with moving neutral particles (since they have no charge, .... Magnetic Force I know that they repel but I don't get the work done and energy conv...

## Let's Clean Up Our Physics Language

www.lhup.edu/~dsimanek/scenario/physlang.htm

Many physicists have extreme difficulty when they try to explain physics to outsiders. ... In the case of the definition of electric field as force/charge, in the MKS system, ... We can't exactly blame students for taking textbooks at their word. ... But since the negative sign just defines a direction in a particular problem, rela...

## Constructing the Coronal Magnetic Field by Correlating ...

solarscience.msfc.nasa.gov/papers/garyga/StretchingPaper.pdf

region cannot be obtained since there is no closed form solution for the non-force -free, ... magnetic field lines originate in a high-beta plasma region,. > 1, in .... region field and the plasma it contains, by reconstructing the coronal field using a novel ... field only) is not sufficient to produce the active region corona. The r...

## NASA's Cosmicopia -- Ask Us - General Physics - Electricity and ...

helios.gsfc.nasa.gov/qa_gp_elm.html

Oct 31, 2008 ... Is it possible that the force we call gravity is actually a magnetic field? Could high ... Gravity is related only to mass and not to electrical charge. .... Fields, whether they are magnetic field lines or gravitational field lines, are simply a ... That would be a perpetual motion machine, and we can't have any of...

## pages 651-700 - Light and Matter

www.lightandmatter.com/simplen.pdf

line charges are in motion in both frames of reference, but in frame 1, the line ... frame of reference, and magnetic effects occur only between moving ... self- consistency, since we have to define the electric field somehow, and the only ..... its kinetic energy: its velocity vector can change its direction, but .... The field can'...

## The largest magnetic fields in the universe - Phys.org

phys.org/news/2013-07-largest-magnetic-fields-universe.html

Jul 26, 2013 ... It has been speculated for a long time that enormous magnetic field strengths, ... The actual demonstration that this is possible has only now been ... Since the star is dynamically unstable, it eventually collapses to a black .... cant & axe, ... this, " field lines" are merely a mathematical construct to ...

### Chapter 27 – Magnetic Field and Magnetic Forces - UCF Physics

physics.ucf.edu

An object that contains Fe is not by itself magnetized, it can be attracted by either the north ... You can draw magnetic field lines just like you drew electric field lines . .... Magnetic force perpendicular to v → it cannot change the ... Bainbridge was able to construct a device that ... After this, in the region of B' particles ...

### electromagnetic radiation - Is Magnetic Field is made of Photon? Is ...

physics.stackexchange.com

Mar 18, 2015 ... Is there any frequency of Magnetic Field waves? ... the What is a magnetic field question which is asked on just 8th march, ... is Made of (Not the Dipole which Cause but the Magnetic field lines)? ... the presence of a magnetic field, since its constituent particles are ... These photons have a given wavelength.

### Theory of electromagnetic fields

arxiv.org

pressions for the energy density and energy flux in an electromagnetic field. ... are sufficiently complicated that solutions to Maxwell's equations cannot .... differential equation involves only the electric field, E, so we have achieved our ..... take additional derivatives of the equations, since this allows us to construct sep...