Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Cross product

  1. Feb 17, 2016 #1
    In the cross product, why is vectorA*B=-(vectorB*A)
    How does the right-hand rule apply to this formula?
     
  2. jcsd
  3. Feb 18, 2016 #2

    Svein

    User Avatar
    Science Advisor

    images?q=tbn:ANd9GcSYKSrl5ft_tg3ul7lg-nng6l3E8DPqJ7qlVL7Bif1vmCg-GMO1sg.jpg Look at the picture. If you rotate A towards B, the right-hand rule points upwards. If you rotate B towards A, the fingers point the opposite way, so the right-hand rule points downwards.
     
  4. Feb 18, 2016 #3

    A.T.

    User Avatar
    Science Advisor
    Gold Member

    Apply the definition of cross product

    265px-Right_hand_rule_cross_product.svg.png
    What happens to the direction of a x b when you rotate the hand to swap the directions of a and b ?
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Cross product
  1. Cross products (Replies: 4)

  2. Cross/dot products (Replies: 1)

Loading...