1. Limited time only! Sign up for a free 30min personal 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!

Finding the resistance of a solenoid?

  1. May 7, 2012 #1
    I have a solenoid with 180 turns, which is 10 cm long. It has a half core of magnets (which could be constituted as part iron core). The magnetic field strength was measured to be 0.004982 T inside the solenoid around the middle when 12v was run through it and 0.004512 without power running through it. To work out the theoretical magnetic field, I have to use Ampere's law:
    B=μ x N x I

    B = 8.75x10^-4(because of the iron core)x180x(current in amps)

    The problem is I don't have the current in amps.

    But I thought I could use Ohm's law:
    V= IR

    and changed it to

    I= V/R

    I need the resistance without measuring it, but I don't know how to get it.
    Last edited: May 7, 2012
  2. jcsd
  3. May 7, 2012 #2


    User Avatar

    Staff: Mentor

    Do you know the diameter of the wire, and the material it's made of? If so, try Googling for "resistivity."
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: Finding the resistance of a solenoid?
  1. Solenoid railgun? (Replies: 4)

  2. Solenoid question (Replies: 1)

  3. Torque on Solenoid (Replies: 2)

  4. Building a solenoid (Replies: 6)