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: Vector calcululus

  1. Sep 16, 2014 #1
    1. The problem statement, all variables and given/known data
    can someone help prove this

    (∇ x A) x A =(A.∇)A-1/2∇Modulus(A power2)

    2. Relevant equations

    3. The attempt at a solution
    (∇ x A) x A =(A.∇)A-∇(A power2)
  2. jcsd
  3. Sep 16, 2014 #2


    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper

    Calcululus - lu = Calculus

    Have you tried expanding out both sides according to the definition of the Del operator and the cross product?

    It looks like a moderately long slog thru vector algebra after that point.
  4. Sep 17, 2014 #3
    Yes I did but what I achieve is the last term without factor of (1/2), don't know what to do now, what I got is (vector A power 2) and required is 1/2*(Modulus( A square)), is there any difference (A square) and Modulus(A square)
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted