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Homework Help: Simple Self-Inductance Problem

  1. Mar 30, 2008 #1
    [SOLVED] Simple Self-Inductance Problem

    1. The problem statement, all variables and given/known data

    Find the inductance L of a long solenoid of length 39.0 cm, and radius 2.30 cm, which has 3.10E2 turns. (Express you answer in units of H for henrys).

    2. Relevant equations


    3. The attempt at a solution

    Okay, so the way I am thinking to solve this problem is to first get the magnetic flux. But I have no idea how to find the current [tex]i[/tex] for a solenoid. Since I don't know how to find [tex]i[/tex], I simply plugged in the formula for flux into the formula for inductance to get:


    That's where I get stuck. *If* I am in fact going about this the right way, do I just find area by using pi*r^2?
  2. jcsd
  3. Mar 31, 2008 #2


    Where A is cross sectional area and l is the length of the solenoid.

    I think...
  4. Mar 31, 2008 #3
    Thanks for the quick response. I got it.
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