Force on a ferromagnetic object

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    Ferromagnetic Force
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Discussion Overview

The discussion revolves around calculating the force exerted on a ferromagnetic object by a magnetic field generated by a solenoid. The scope includes theoretical considerations and practical applications related to a DIY coilgun project.

Discussion Character

  • Exploratory, Technical explanation, Experimental/applied

Main Points Raised

  • One participant inquires about methods to estimate the force on a ferromagnetic object due to a solenoid's magnetic field.
  • Another participant notes the complexity of the calculation, highlighting the importance of the magnetic field gradient.
  • A further comment suggests that the gradient is relevant due to the nature of magnets having two poles, affecting the net force based on the differential forces at each end.
  • It is acknowledged that inducing a magnetic dipole in the ferromagnetic object adds complexity to the situation.
  • A participant mentions their practical application, indicating they are building a DIY coilgun and anticipates using trial-and-error for their calculations.

Areas of Agreement / Disagreement

Participants express varying levels of understanding regarding the calculation of forces, with some acknowledging the complexity involved. There is no consensus on a definitive method for calculating the force.

Contextual Notes

The discussion highlights the dependence on the magnetic field gradient and the need for inducing a magnetic dipole, which may not be straightforward. The calculations are also influenced by the specific setup of the solenoid and the ferromagnetic object.

Who May Find This Useful

Individuals interested in electromagnetism, DIY electronics projects, or those exploring the principles of magnetic forces in practical applications may find this discussion relevant.

mahela007
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How can one calculate (even as a rough estimate) the force exerted on a ferromagnetic object by a magnetic field created by a solenoid? Thanks
 
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With great difficulty, since it depends on the gradient of the field, which is not simple for a solenoid.
 
oh well..
Just for the sake of knowledge, does the gradient of the field come into play because all magnets have two poles and because the net force depends on the difference between the force on each end?
 
Yes - although in this case it's more complicated, since you need to induce a magnetic dipole in the object.
 
well, I asked this question because I'm building a simple DIY coilgun.. (just 8J of energy stored in the caps). So I'm going to have to resort to trial-and-error. Thanks for your help.
 

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