# Solenoid Field Problem

1. Oct 9, 2009

### I_am_learning

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?

Last edited: Oct 9, 2009
2. Oct 9, 2009

### 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.

3. Oct 9, 2009

### 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?

4. Oct 9, 2009

### Staff: Mentor

What is the context of your question?

5. Oct 9, 2009

### I_am_learning

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.