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

[I_am_learning]

Given a solenoid we can find the field inside and at the ends by B=u_rNI.
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?

 

[Born2bwire]

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.

 

[I_am_learning]

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?

 

[berkeman]

Given a solenoid we can find the field inside and at the ends by B=u_rNI.
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?

 

[I_am_learning]

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.