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: Modified Ampere's law

  1. Sep 4, 2005 #1
    Hi I was wondering if you can help me.

    How is the concept of the displacement current used to resolve the ploblems with the application of Ampere's law.

    I know that the modified ampere's law is

    curl(B)=Mew(0)(jc+jd)

    I just know how the displacement current jd is used to solve the ploblems with amperes law in the continuity equation

    If anyone at all help me I would be greatful. It is a pass exam paper that I am revising, and is worth 6 marks.

    thanks in advance

    hhh79bigo
     
  2. jcsd
  3. Sep 4, 2005 #2

    lightgrav

    User Avatar
    Homework Helper

    Ampere's Law is only valid for "static" currents.
    If there's a time-dependance (charge build-up),
    then its dE/dt also is surrounded by curling B.

    Is this a "practical" application whee Ampere fails?

    In a radio antenna, current up a wire accumulates
    Q at the end; B is stronger at top due to dE/dt.
     
  4. Sep 4, 2005 #3
    by the way...

    it's "mu," not "mew."

    mu: the greek letter.

    mew: the sound a cat makes.

    :biggrin:
     
  5. Sep 5, 2005 #4
    To be honest with you that isn't much help at all really. Why post something if you don't know the answer????

    A cat makes a meow sound by the way!!!!
     
  6. Sep 5, 2005 #5

    Astronuc

    User Avatar
    Staff Emeritus
    Science Advisor

  7. Sep 5, 2005 #6
    alright, then.

    mew: the 151st pokemon, from the original series. :tongue:
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook