1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Calculate the inductance of a coil of wire

  1. Mar 19, 2013 #1
    1. The problem statement, all variables and given/known data

    Calculate the inductance (SI units: Henries) of a coil of wire having a loop diameter of 0.5 cm and coil length of 10 cm. The wire has 1000 loops per meter.


    2. Relevant equations

    I think I can use this equation:
    L= μₒAN² / x, x = length of wire, μₒ = 4π*10^-7 Tm/A
    A = πr^2

    3. The attempt at a solution

    L= μₒ(πr^2)N² / x
    = μₒ(π(0.0025 m)^2)*(1000^2) / 0.1 m
    = 7.85 * 10^-5 H

    But apparently on my homework assignment that is wrong. Am I using the wrong formula?

    Edit: fixed units
     
    Last edited: Mar 19, 2013
  2. jcsd
  3. Mar 19, 2013 #2

    gneill

    User Avatar

    Staff: Mentor

    Take a closer look at your value for N.
     
  4. Mar 19, 2013 #3
    @ gneill: I'm not sure if I'm thinking about this correctly but since I was given 1000 loops per meter, would I have to multiply this by the length (0.1 m) in order to just get the number of loops (N)?
     
  5. Mar 19, 2013 #4

    gneill

    User Avatar

    Staff: Mentor

    That would be logical, right?
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Calculate the inductance of a coil of wire
  1. Inductance of coils (Replies: 5)

Loading...