Energy imparted to an ion by a magnetic field

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Discussion Overview

The discussion centers around the interaction between an anion and a magnetic field, specifically whether a magnetic field can exert a force on the anion and the implications for kinetic energy. Participants explore concepts related to electromagnetic forces, the nature of magnetic poles, and calculations of energy transfer.

Discussion Character

  • Exploratory
  • Debate/contested
  • Technical explanation

Main Points Raised

  • Some participants question whether an anion placed near the negative pole of a magnet will experience a repulsive force.
  • Others clarify that negative charges repel negative charges, but the poles of a magnet are not charged.
  • There is a request for calculations regarding the kinetic energy imparted to the particle and the source of power in this interaction.
  • Some participants suggest using Coulomb's law for calculations, while others note that it applies to force rather than kinetic energy.
  • A distinction is made that magnets have north and south poles, not negative poles, which leads to confusion about the terminology used.
  • It is noted that if the anion is stationary when placed near a magnetic pole, it will not experience a force, but if it has velocity, the force will depend on the direction of the velocity and the magnetic field.

Areas of Agreement / Disagreement

Participants express disagreement regarding the nature of forces acting on the anion in relation to magnetic fields, with some asserting that magnets do not exert forces on stationary charges while others discuss the implications of charge movement.

Contextual Notes

Participants highlight limitations in understanding the interaction between magnetic fields and charged particles, particularly regarding the definitions of magnetic poles and the conditions under which forces are applied.

Ken H
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Basically my question is: if an anion is placed by the negative poll of a magnet will it push on the particle?
 
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Negative charges repel negative charges, and positive charges repel positive charges.
 
Is there a calculation for the amount of kinetic energy imparted to the particle? Also where does the power come from, is the strength of the magnetic field reduced?
 
Ken H said:
Is there a calculation for the amount of kinetic energy imparted to the particle?
Perhaps Coulomb's law? I'm no master of electromagnetism but it seems like the equation would apply in this case.
 
Coulomb's law would give you the force, though, and not kinetic energy. You would have to use other equations to find the kinetic energy.
 
Ken H said:
Basically my question is: if an anion is placed by the negative poll of a magnet will it push on the particle?
No. The poles of a magnet are not charged.
 
Dale said:
No. The poles of a magnet are not charged.
If it is just a negative pole in general it would still repel the anion though, correct?
 
Magnets don't have negative poles. They have north and south poles.
 
Dale said:
Magnets don't have negative poles. They have north and south poles.
I don't know why I used poles in that. I just meant a negative charge.
 
  • #10
Yes, an anion is negatively charged so it will be repelled from other negative charges. This has nothing to do with a magnet since magnets are typically uncharged.
 
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  • #11
Going back to the original question, if you "place" a charge near the pole of a magnet, and if the word "place" means the charge is not moving when you place it, then, as Dale stated above, there is no force on the charge. If the charge has a velocity, there is a force on the charge depending on the direction of the velocity and the magnetic field.
 
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