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!

Solonoid with iron core

  1. Apr 27, 2013 #1


    User Avatar

    How do i calculate the amound of windings I need to make an solonoid electro magnet with around 1 T..

    I checked with google, and there seesm to be a lot of different formulaes which confusses me alot..
  2. jcsd
  3. Apr 27, 2013 #2
    One Tesla is a significant magnetic field for an electromagnet in continuous operation, so unless you're talking about pulsed operation, you're not going to like the answer. The exact answer will vary depending on where you measure the field, what metal/alloy your core is made of, and so forth, but it's somewhat beyond what one can achieve with a homemade electromagnet. If you can give some additional detail, I can provide you the relevant equation.
  4. Apr 27, 2013 #3

    Simon Bridge

    User Avatar
    Science Advisor
    Homework Helper

  5. Apr 27, 2013 #4


    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper

    Current MRI machines operate between 0.2 and 3 teslas. A standard strength MRI with a 1.5 T field costs between US$1.0 million and US$1.5 million. In order to produce this field strength, the MRI machines use cryogenically cooled superconducting electromagnets. Good Luck with a plain old iron-core solenoid!
  6. Apr 28, 2013 #5


    User Avatar

    Well 1T Where maybe a bit extreme.. its more like 0,46T, and i want it at the side, or int he bottom, and yes it has to be pulsed..

    I've been using different formulaes, but no one seesm to take the iron core with in their calculation, which results in different number of winding.. I am only using 1Amp.

    First one is using Biot savart formula.

    B(z) = [itex]\frac{µ0}{2pi}[/itex]*[itex]\frac{µ}{z^3}[/itex]

    Where µ here is the dipole moment.. µ= N*i*A

    Second one

    Where xm =5*10^3 is the ironcores suscebility, and H is the magnetic intensity which is the

    Here is the iron core taken into acount, but my winding number is too high.. around 10000..

    So which one should i Use..
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook