Magnetism: Same Pole Repulsion & Heteropolar Attraction

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SUMMARY

This discussion centers on the principles of magnetism, specifically the same-pole repulsion and heteropolar attraction of magnets, and their interaction with the Earth's magnetic field. Participants clarify that the force between magnets is influenced by the gradient of the magnetic field rather than the field itself. The Earth's magnetic field intensity ranges from 25,000 to 65,000 nanoTeslas, with maximum forces on magnets at the poles being negligible, approximately 12 nanoNewtons. The conversation emphasizes the importance of empirical experimentation to understand these magnetic interactions.

PREREQUISITES
  • Understanding of basic magnetism concepts, including same-pole repulsion and heteropolar attraction.
  • Familiarity with the Earth's magnetic field and its intensity measurements in nanoTeslas.
  • Knowledge of magnetic field gradients and their effects on magnetic forces.
  • Basic principles of torque as it relates to magnetic fields and compass behavior.
NEXT STEPS
  • Research the effects of magnetic field gradients on magnet interactions.
  • Explore experimental methods to measure magnetic forces and torques.
  • Study the geomagnetic field and its variations across different locations on Earth.
  • Investigate the properties of neodymium magnets and their applications in real-world scenarios.
USEFUL FOR

Physics students, educators, and researchers interested in magnetism, as well as hobbyists conducting experiments related to magnetic fields and forces.

  • #31
renormalize said:
a negligible 12 nanoNewtons.
Confirm again, 12 nanonewtons is the attraction between the magnet and the earth's magnetic field?
A new question is added here, if the earth's magnetic induction increases by 10,000 times, find the attraction between the magnet and the earth's magnetic field at this time.
 
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  • #32
If nothing saturates ( probably true in this situation) then it will increase by ten thousand. We are assuming that you know how to turn up the Earth field.....an unlikely circumstance.
 
  • #33
This thread seems to have run its course, so it will be closed now.

Hir is correct that the magnetic force on a magnet is caused by the gradient of the magnetic field (its non-uniformity), and without a gradient you only get a torque (which is why compass needles align with the magnetic field).
 
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