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: Magnetostatic Problems

  1. Sep 15, 2004 #1
    1) Calculate the self-inductance of a coaxial cable of inner radius a and outer radius b. The inner conductor is made of an inhomogenous material having u = 2u0/(1+r)
    Answer : u0L/8pie + u0L/pie (ln(b/a) - ln((1+b)/(1+a)))

    2) Two #10 copper wires(2.588 mm in diameter) are placed parallel in air with a seperation distance d between them. If the inductance of each wire is 1.2uH/m, calculate
    (a) L(in) and L(ext) per meter for each wire
    (b) The seperation d
    Answer : (a)0.05, 1.15 uH/m, (b) 40.79cm

    3) A conductor of radius a is bent into a circular loop of mean radius r. If r = 10cm and 2a = 1cm, calculate the internal inductance of the loop.
    Answer : 31.42nH

    Really can't the number 1 answer. I get a^3 in my answer. Number 2 no idea since L = L(in) + L(ext). As well as number 3.

    Thank you.

    Attached Files:

    • q3.JPG
      File size:
      4.1 KB
    Last edited: Sep 16, 2004
  2. jcsd
  3. Sep 16, 2004 #2
    cannot use Latex code anymore?
  4. Sep 16, 2004 #3


    User Avatar
    Science Advisor
    Homework Helper

    Apparently they changed servers and LaTeX broke but they're working on fixing it.
  5. Sep 16, 2004 #4
    anyone can help me on these magnetostatic problems? i'm stucked ..
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook