Solving Solenoid Field Problem: B=urNI & Force on Iron

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Discussion Overview

The discussion revolves around the magnetic field produced by a solenoid, specifically addressing the field strength at a distance from a finite length solenoid and the force exerted on a piece of iron placed within that field. The scope includes theoretical considerations and practical implications of magnetic fields in solenoids.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant states that the magnetic field inside a solenoid can be calculated using the equation B=urNI, but questions the field strength at a distance from the solenoid.
  • Another participant notes that the equation assumes an infinite solenoid, indicating that for finite solenoids, the problem is more complex and has been previously studied.
  • A different participant suggests to focus on the force exerted on iron once the field strength is calculated, without delving into the complexities of finite solenoids.
  • One participant reiterates the initial questions about the magnetic field strength along the axial line of a finite solenoid and the force on iron at a specified magnetic field strength.

Areas of Agreement / Disagreement

Participants express differing views on the complexity of calculating the magnetic field for finite length solenoids, and there is no consensus on how to approach the problem or the specifics of the force on iron.

Contextual Notes

The discussion highlights the assumption that the equation B=urNI applies to infinite solenoids, and the challenges posed by finite length solenoids remain unresolved. There is also ambiguity regarding the specific conditions under which the force on iron is considered.

I_am_learning
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Given a solenoid we can find the field inside and at the ends by B=urNI.
Now, what is the field strength at some x -axial distance away from the solenoid?
What force will this field impart on a piece of iron?
 
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That equation assumes that the solenoid is infinite, in which case the field outside the solenoid is zero. For a finite length solenoid, it is a more difficult problem but one that has ben studied previously I am sure.
 
Leave the problem for finite length solenoid now, Born2bwire.
Even if we calculate the field Strength B, what force will it impart on a piece of iron?
 
thecritic said:
Given a solenoid we can find the field inside and at the ends by B=urNI.
Now, what is the field strength at some x -axial distance away from the solenoid?
What force will this field impart on a piece of iron?

What is the context of your question?
 
berkeman said:
What is the context of your question?
I am just asking two elementary questions
1. What is the magnetic field strength at any given point on the axial line of a finite length current carrying solenoid.
2. What force will a piece of iron experience if it is placed at the point where magnetic filed strength is say 10 tesla.
 

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