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

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The discussion centers on determining the magnetic field strength at a specific axial distance from a finite length solenoid and the force exerted on a piece of iron placed in that field. While the equation B=urNI applies to infinite solenoids, the field strength for finite solenoids requires more complex calculations. The participants acknowledge the challenge of finding the magnetic field outside a finite solenoid, which is not zero as it is for infinite solenoids. Additionally, the force experienced by iron in a magnetic field of 10 tesla is questioned, highlighting the need for further analysis. Understanding these concepts is essential for applying electromagnetic theory in practical scenarios.
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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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