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!

Homework Help: The logic of the self inductance formula

  1. Aug 28, 2009 #1
    [tex]M_{12}=\frac{N_2\phi _{12}}{I_1}[/tex]

    i need to remmeber it

    but i cant see the logic of
    the formula
  2. jcsd
  3. Aug 30, 2009 #2
    I thought the formula looked something like: [tex]\frac{\mu_{0}N^2 A}{l}[/tex]. A is the cross section & magnetic field inside the solenoid is [tex]B=\mu_0 NI/l[/tex], flux through one loop is [tex]BA=\mu_0 N IA/l[/tex] and [tex]\Phi= \mu_0 N^2 I A/l[/tex] is the total flux. The inductance is just total flux divided by current.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook